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2D Geometries

A few German sacred geometry books available for shipping costs only

Sunday, 2 November 2025 by Bruce Rawles

Update 2 November 2025: We’ve been back in Oregon for a few weeks, and I still have a handful of German books to find homes for, so I’m re-dating this post in case anyone would like to purchase a book for only my shipping costs!


Update 21 July 2024: We’ve been in Arizona for exactly a year today, and I still have a handful of German books to find homes for, so I’m re-dating this post in case anyone would like to purchase a book for only my shipping costs!


(Originally published 25Jun2023):

We’re making good progress toward moving to Arizona (mid-July 2023), so I’m anticipating having more time to do in-depth posts after our move. Meanwhile, I’d still like to lighten our load and not move these books yet another time… I’m offering (until mid-July, while supplies last) – limited supply; limited offer) asking only for my shipping costs (US only) or free if you happen to be on the central Oregon coast and can pick them up here in Yachats before we move! in the Tucson, AZ, Portland, OR metro area, and can pick them up.

German sacred geometry books are available for shipping only (for a limited time!)

I have a handful of both of my German-translated books:

  • Mandalas der Heiligen Geometrie (MDHG) das universale Design der Natur (SGDS German edition)
  • Bewusst malen – Heilige Geometrie

(If you live in Germany, you’ll probably want to order the Bewusst malen – Heilige Geometrie book, still in print, directly from the publisher, Silberschnur Verlag, since the shipping from the USA to Germany is likely more than buying it locally.)

If you speak German or know someone who does and has the least interest in geometry, I am offering special FREE books (very limited supply) of both of these books if you cover my postage costs. If you live near Yachats, Oregon, Green Valley, Arizona, Hillsboro, Oregon, you can pick them up here and skip the postage expense. For details on these limited-time, limited-supply books, contact me.

Note that you don’t have to be able to read or understand German to enjoy either of these books, as they are both lavishly illustrated – FAR more imagery than text. Also, each copy of the out-of-print MDHG book has a unique set of die-cut fold-up models of the 5 Platonic Solids (included behind the back cover) that make a neat mobile if you add your own thread.

MDHG Platonic Solid fold-up mobile

Please contact me before mid-July 2023 if you are interested in this special offer!

Mandalas der Heiligen Geometrie (MDHG): German edition of Sacred Geometry Design SourceBook by Bruce Rawles - GeometryCode.com

sacred geometry coloring book (German): Bewusst malen - Heilige Geometrie by Bruce Rawles


Here are a few more interesting geometry-related links (videos) that have crossed my path recently; several short introductory videos that add some useful and interesting additions to commonly cited facts:

  • Golden Spiral Symbol – What Does It Mean?
  • What Makes the Golden Spiral Symbol Special?
  • What is Sacred Geometry? (evidently using an AI-generated voice/script?)
  • How Does the Golden Spiral Relate to Sacred Geometry?
  • What is the Meaning of the Golden Spiral?
  • What are Some Examples of the Golden Spiral?
  • What is the Fibonacci Sequence?
  • … and several others…

Filed Under: 2D Geometries, 3D Geometries, coloring books for adults, Fractal Geometry, golden ratio, Platonic Solids, polyhedra, sacred geometry art, sacred geometry books

AI Geometric Art Tools

Sunday, 24 August 2025 by Bruce Rawles

This post will pose more questions than answers, since it seems we’re still in the “wild west” early days of popular adoption of a plethora of AI offerings, and I am hardly keeping up with all the developments in so many sectors as “everyone and their uncle” jumps on the proverbial AI bandwagon!

(I’m also in the midst of moving from Arizona back to Oregon, so this will be a quick commentary! I hope to have much more useful information, helpful resources, and examples in a future post!)

In prior posts, I’ve dabbled with some AI-generated geometric imagery:

  • Digital dabbling with Dall-E (early primitive experiments)
  • AI generated geometry – revisited a few months later (a little further along, but still nascent)

Here is an example from the more recent post:

Dall-E 3 AI-generated image using prompt "make an image of (a) sea of mirrored geodesic spheres" thanks to Dave Van Dyke

Here is an example from the earlier post:

While the geometric imagery generated by artificial intelligence is often stunning, I typically notice that the images frequently don’t provide accurate models of precise geometric archetypes, being more oriented toward popular art and illustration than images for science, engineering, or renderings with CAD accuracy. If one looks closely, there are inconsistencies and “wonkiness” that don’t hold up to zoomed-in scrutiny if one wants the photorealism that ray-tracing software can achieve.

Do you know of websites, software, AI apps running on various platforms, browsers, devices, etc., that address this seeming void in AI functionality? I’m hoping that soon we’ll find mechanisms that assist in generating imagery with the same accuracy as ray-tracing software using precise geometric coordinates for the vertices of polyhedra, for example. If so, let me know via our contact form.

I found this web page of “AI Geometric Art Examples” by Open Art that looks promising, but when I click on the “… create …” buttons, I arrive at a more generic-looking interface. I’ll explore further when I have more time, but I’m eager to hear from readers if you’ve found good AI for geometry. Here’s a nice image from the page noted above:

AI Geometric Art Example by OpenArt
AI Geometric Art Example by OpenArt

I posed this query: “geometric image generation for science, engineering, renderings with CAD precision” to my browser (Brave) and got this response:

“Geometric Image Generation for Science
Recent advancements in geometric image generation for science, engineering, and high-precision renderings are increasingly focused on bridging the gap between visual data and parametric Computer-Aided Design (CAD) models. A significant development is the CADCrafter framework, which generates parametric CAD models directly from unconstrained real-world images, such as those captured by users with standard cameras.
This approach leverages a latent diffusion model conditioned on geometric features like depth and normal maps, which are invariant to texture and help mitigate the domain gap between synthetic training data and real-world images.
To ensure the generated CAD command sequences are geometrically valid, the model employs direct preference optimization (DPO) fine-tuning using feedback from an automatic CAD compiler, which acts as a code checker to categorize outputs as valid or invalid.

This method addresses the limitations of traditional generative models that produce 3D shapes with rough surfaces and indistinct edges, which lack the precision required for manufacturing and simulation.
By training solely on synthetic textureless CAD data and testing on real-world images, CADCrafter demonstrates robustness and generalization to unseen objects, even when processing single-view images.
The framework’s ability to distill knowledge from multi-view to single-view inputs enhances its accuracy and practicality for everyday applications.

Further, geometric deep learning (GDL) techniques are being applied to analyze and generate CAD data directly from complex representations like Boundary Representation (B-Rep), which encodes high-level parametric details.
GDL methods, including Graph Neural Networks (GNNs) and Transformers, are used for tasks such as similarity analysis, retrieval, synthesis, and autocompletion of CAD models, aiming to automate repetitive design tasks and facilitate design reuse.
These methods can learn intricate geometric features from B-Rep data without converting it to formats like meshes or point clouds, thus avoiding computational expense and information loss.

For applications involving imaging data, such as microtomographic scans, fast, realistic simulations on GPUs are used to generate synthetic CT images that include realistic artefacts like beam hardening and photon noise.
These simulations are crucial for creating accurate CAD models from data affected by strong imaging artefacts, enabling precise geometric analysis of materials and structures.
The gVirtualXray (gVXR) framework exemplifies this, simulating X-ray projections and CT volumes in milliseconds on a GPU, which is orders of magnitude faster than Monte Carlo simulations, while maintaining high accuracy.
This speed enables the use of repetitive simulations for tasks like image registration and training deep-learning algorithms.

These integrated approaches—combining image-to-CAD generation, geometric deep learning, and high-fidelity simulation—represent a transformative shift towards creating precise, editable, and manufacturable digital twins from diverse data sources, significantly enhancing workflows in science, engineering, and design.

AI-generated answer. Please verify critical facts.”

(Note the now familiar disclaimer in the last line.)


Do you have suggestions for future GeometryCode.com blog posts? Please let us know; we just updated and simplified our ongoing survey here.

Filed Under: 2D Geometries, 3D Geometries, AI-generated geometric art, applications, polyhedra, sacred geometry apps, sacred geometry news

Details about contents of Sacred Geometry Design Sourcebook and instructions for creating the graphics therein

Saturday, 19 July 2025 by Bruce Rawles

I’m glad I reviewed some of my oldest posts, as this post (originally published January 30, 2007) needed resurrecting and updating! I will leave the details from 18 years ago mostly intact, so if you want to dive in, scroll down to the “HOW-TO” INFO STARTS HERE heading for lots of “how to” info on many of the pages to make optimum use of my first book, Sacred Geometry Design Sourcebook!


Here’s another post from my blog archives that details the contents of specific pages of my Sacred Geometry Design Sourcebook, as well as instructions on how to replicate many of the images in the book.

30Jan2007 09:17 AM Filed in: Geometry-Math
Today’s post is an email conversation I had with a visitor to the intent.com website – our first website, which has changed hands several times since the 1990s! – that I probably could have written a decade ago, so this might be useful to those of you who already have purchased a copy of the book (and thanks to all of you who have supported me in this way over the years!) There are a few other goodies on my site map that might also be of interest.

Hi Julian:

Many thanks for your inquiry. I got so involved with the reply that I’ve decided to post it on my blog for today, as well as in this email; I’m grateful that you asked the question, so now I can answer it for the world.

On 30 Jan 2007, at 6:54 AM, Julian wrote:

Dear Bruce:

I was reading your web pages about your book SACRED GEOMETRY DESIGN SOURCEBOOK, and I wondered if you could tell me whether the book provides the reader with details of how to draw the 2-D patterns for themselves or whether they are just templates without such instruction.

The simplest answer is “yes and no”, depending on which of the 1300+ images you’re referring to.


The detailed answer is – here goes! – that I cover some of the philosophy and underlying math, concepts, and archetypal ideas at the beginning of the book, and provide a
generous assortment of references in the back of the book. For the remainder (majority of the 256 pages), I give the images as much room as possible so that not only can the patterns be photocopied easily (I went with spiral binding just for that reason), so that the image quality would be as high as possible for an 8.5″ by 11″ format.

“HOW-TO” INFO STARTS HERE:

Some of the illustrations give step-by-step procedures (in graphical form, assuming some basic familiarity with how to use a compass and straightedge, such as:

page 44 (showing how “unit cells” for the tiling patterns can be used to create an enormously expanded variety of additional patterns by recognizing how the space-filling shapes can be varied; this applies to the “unit cell” examples on pages 16-43,

page 45 (showing how each of the patterns on pages 16-43 can be embellished with fractal or other inscribed detail for each of the polygons for an infinite (literally!) variety of possible variations, which also apply to the majority of the remaining images in the book; page 237 gives a 3D example of this),

pages 46-84 have either explicit (most of these pages) or simple to observe implicit “unit cells” which show how these can be created in a great variety of ways,

page 84 (Pentagon Rotation Grid) gives the 73.2% proportion crucial to the exact construction of this pattern,

page 85 (Genesis of the Seed of Life) shows the step-by-step “compass only” construction of this important and universal pattern,

page 86-95 (variations on Seed of Life and Flower of Life) show how once the Seed of Life is constructed, many other patterns can be easily derived – Flower of Life, Hexagonal Grid, 2nd Harmonic Overlay which is used in Mika Feinberg’s beautiful LightSOURCE screensaver animation (no longer available); see my links (resources) page, Tree of Life, Fruit of Life, Heart and Ankh matrices, recursions, Metatron’s Cube, etc.,

page 95: since the Dodecahedron is the most complicated shape to derive from Metatron’s cube, the top center illustration on this page shows which vertices are used to create the “dodecahedron 2D shadow” with small circles highlighted in the larger image,

page 96: The general instructions for creating Nested Inscribed Polygons appear on this page,

pages 100-101-102: other examples of the crucial proportions needed to create these images either by hand or with a computer graphics program; numerous pages provide these instructions in the text without detracting from the space given to the images,

pages 104-105, 110-113, 123-124, 128, 130, 138-139, 144-145, 155, 163, 166, 171, 176-180, 182-187: all have instructions and details on how to create the images,

page 146: very detailed step-by-step instructions for inscribing a pentagon within a circle,

page 147: very detailed step-by-step instructions for inscribing a pentagon starting from one side of a given length,

page 156: very detailed step-by-step instructions for creating a golden rectangle (including “whirling squares and more),

page 156: very detailed step-by-step instructions for dividing a line by the golden ratio,

page 157: very detailed mathematical information about golden ratio progressions and powers, illustrated graphically,

page 188: shows how the Parthenon at the Acropolis in Athens, Greece, incorporates the golden ratio,

page 189: an amazing amount of data on this page about the Great Pyramid at Giza, Egypt showing phi (golden ratio) and pi proportions, and the proportions of the so-called “King’s Chamber” although the so-called “sarcophagus” (granite box) within is too large to fit through the only passage leading into that chamber, which violates the generally accepted funerary rite theory,

page 190: the classic “Measure of Man” (Vitruvian Man) by Leonardo daVinci, copied around the world, showing the golden ratio proportions in the human body,

page 191: the only known CAD drawing adaptation (to my knowledge) of Leonardo’s “Ideal Church” sketch,

page 192: detailed specifics about the Shoemaker’s Knife of Archimedes, giving several variations all showing the mathematical principle,

page 194: details of the geometry of the classic 1991 Barbury Castle, England crop circle formation,

page 195 and page 52: the details of the geometry encoded in the Sri Yantra (a classic Hindu mandala) and the cross section of the Great Pyramid at Giza, Egypt (also the “squaring the circle” conundrum), both with a 1-Phi-Square Root of Phi triangle which has a 51 degree, 51 minute slope,

page 196: numerous details common to the 5 Platonic and 13 Archimedean Solids,

pages 197-214; numerous details specific to the 5 Platonic and 13 Archimedean Solids, including how the insphere/intersphere/circumsphere/side length proportions are calculated,

pages 215-224: similar details specific to the 4 Kepler-Poinsot solids, the Star Tetrahedron (a.k.a. Stella Octangula) and related polyhedra,

pages 225-229: numerous graphics showing how the Platonic Solids relate to each other in a myriad of fascinating (awe-inspiring, really!) ways,

pages 230-235: numerous relationships between 3D polyhedra with 5-sided symmetry and the “shadow” they cast on a decagon (10-sided polygon), with construction details,

page 236: step-by-step instructions on creating an accurate drawing of the Icosahedron and Dodecahedron starting from a Golden Rectangle,

pages 237-255: generous appendices for hands-on explorers of all ages and levels of experience, including tables and charts of regular polygon angles, apothem, radius and side ratios and areas, radius ratios by coordination number for Ionic Chemical Bonding (which relates to properties of materials at the molecular and planetary levels), Fibonacci Numbers, Perfect Right Triangles (when I put the book together, I wasn’t aware of the Phi-1/Phi-Square Root of 3 Right Triangle that Mike Green of British Columbia introduced me to), Prime Numbers, extensive tables with all sorts of data on the Platonic and Archimedean Solids (useful for a variety of purposes, including model construction and computer simulation and animation, a map of planet Earth showing superimposed Platonic Solid Vertex Latitudes and (example) Longitudes, a fun stereogram with 6 Small Stellated Dodecahedra (there, I gave the clue  a short bio of myself, 3 pages of bibliography (more on my books and links pages and blog), and unique graphical index to all the illustrations in the book. Whew! I’d almost forgotten how much I packed into this labor of love over a decade ago!

Many of the 1300+ images are somewhat self-explanatory graphically (especially if you have created the basic shapes like the Seed of Life, Golden Rectangle, and a few others by hand with compass and straight-edge, which I highly recommend for anyone, as mentor Keith Critchlow so aptly reminded me when reviewing my original manuscript)…

… and of course, if you find re-creating one of the patterns challenging, I’d be happy to answer other questions via email so that I can share with other enthusiasts; thanks for asking!

Filed Under: 2D Geometries, 3D Geometries, Fractal Geometry, sacred geometry art, sacred geometry books

Rithmomachia Game – David Joyner’s paper

Thursday, 12 June 2025 by Bruce Rawles

Here is a paper (87 pages in compiled LaTeX PDF format) of interest for math nerds from a long-time friend and cousin-in-law,* David Joyner. His stratospheric mathematical fluency and expertise (a retired math professor) leave me on terra firma, admiring his flights into esoteric math realms where my familiarity is negligible. Still, I’m trusting that it will resonate with the global math community. You can read more from David directly via his blog, Yet Another Mathblog

David’s book (Rithmomachia: is recreational arithmetic – a trimmed-down version of the paper) is also available on Amazon here.

David describes the Rithmomachia Game in detail in his document with this overview:

“The basis is in a Pythagorean philosophy of mathematics (where numbers and Platonic shapes have spiritual significance.)”

* I’m not sure if “cousin-in-law is the correct term. David & I met at my Aunt Gayle and Uncle Joe’s cabin at Lake Kirkwood, California, when we were in our late teens or thereabouts. David & I shared a beloved “Uncle Joe”; Joe was David’s uncle by blood, and my uncle by my aunt’s marriage. Can you tell I’m not a genealogist, either?

When David & I met, I had written up and hand-illustrated a few pages on the Golden Ratio, mostly gleaned from the two books below, both gifts to me in my adolescent years, both mentioning the golden ratio in different contexts – man-made architecture and natural geometric forms, which led me to explore what became known to many as “sacred geometry”:

  • Secrets of the Great Pyramid by Peter Tompkins
  • This Living Earth by David Cavagnaro

David pursued his interest in math and became a professor! Happily, we reconnected some years ago, after he discovered this (GeometryCode.com) blog.

Here’s David’s treatise: The Recreational Arithmetic of Rithmomachia. Enjoy!

Rithmomachia gameboard: David Joyner
game board graphic: The Recreational Arithmetic of Rithmomachia by David Joyner

Filed Under: 2D Geometries, geometry games

What really makes “sacred geometry” sacred: beyond symbols to source

Saturday, 10 May 2025 by Bruce Rawles

I’m occasionally asked what makes “sacred geometry” sacred. A short answer I often give is something like: “Either everything is sacred, or nothing is sacred, depending on one’s perspective.”

From the perspective of the all-encompassing, inclusive non-dual Identity that we all share that transcends the personal, we’re all one in the same essence: our eternal transpersonal nature embraces and encompasses all creation and is a reflection of Perfect Oneness, the sacred unchanging innocence of the changeless, timeless, spaceless, formless Unity. Non-duality is a term that attempts to convey the idea of this sacred reality, which transcends ideas, words, and symbols. However, ideas, words, and symbols can, at best, be properly understood – merely reflect some aspects of the quintessential experience of our steadfast source.

It is only when we harbor nightmarish grievances against parts of our Self that seem split off and separate – the profane belief we could be apart from ourselves, each other and our Creator – that we seem to exist in a state of perpetual war, or at least a less than peaceful ceasefire amid the challenges of an uncertain, lonely and fearful world. The world of duality, conflict, polarization, contrast and differences is our default experience in this world, making it seem like the only alternative, yet there is a part of our mind – however deeply buried – that remains connected to Source, an abiding awareness that remembers our inseparability from the eternal perfection of creation, despite our challenge to awaken that possibility, let alone make that our every day experience.

As the Greek philosopher Plato taught, there is a deeper reality beyond the forms that appear to us in the material world. Elsewhere on this website, there are numerous references to the five regular polyhedra credited to Plato called the Platonic Solids, building blocks of three-dimensional geometry and primary to countless forms in our space-time dimensional world. Plato suggested that these 3D geometric symbols represented five elements: tetrahedron (fire), hexahedron or cube (earth), octahedron (air), icosahedron (water), and dodecahedron (ether or spirit).

Plato also was credited with inexorably leading his students back to the un-manifest realm of mind (source) rather than become muddled and confused by the seemingly endless variations and permutations of form (symbol) and his upward pointing finger in the “School of Athens” painting reminds us that understanding begins with returning our mind to cause (source) rather than obsessing over effect (symbol.) The “back to top” symbol on this website is the zoomed-in hand of Plato pointing up, reminding us to get “above the battleground” of duality before trying to contemplate or comprehend the paradoxes of our dualistic world.

That vertical orientation of Plato’s upward-pointed finger symbolizes the inevitable (and joyous) return to oneness. It represents the undoing of the fragmentation of dualistic thinking expressed in our lives as “we/they” and “us vs. them” polarizations, as well as the myriad forms in which we compare two or more things for the purpose of maintaining our belief in separation. One can look at anything in the world in terms of intrinsic oneness, with duality or multiplicity being merely an “optical delusion of consciousness” as Albert Einstein put it; in that state of mind, everything becomes an opportunity to heal our minds of warring interests and perspectives as we forgive ourselves for investing in interpretations that are merely silly mistakes and amusing errors, easily correctible from the proper vantage point … above the world of dividing symbols.

Plato is also famous for his Allegory of the Cave, which draws one’s attention to the metaphysical symbolism of light and shadow. The reality we don’t see in our imprisoned mental state – where we are fascinated by a world of sensory and material distractions, diversions, and deceptions – is the light of day that casts shadows on the wall of the metaphoric cave of mindlessness. We’re identified with shadows (symbols) instead of the greater reality of the shared light that is our common identity (source) and we’re so inured and adjusted to this extremely deficient (mis)perception that we don’t want to be reminded that there is a real alternative to our dark and dismal self-imposed prison in the labyrinthine cavernous abyss of duality.

We could look at any number of geometric forms for examples of these two perspectives – two completely mutually exclusive thought systems – that reflect our journey back to source using symbol as a starting point, and returning us to our shared essence as the ultimate destination.

“… the destination is at the source.” – Michael Hedges, Road to Return (Lyrics)

The graphic below symbolizes two identical circles in five arbitrary stages of “returning to source” (unity) from our perception of duality. The circle is a symbol of perfection as there is no point on the circle that is further or closer to the center than any other. All symbols are inherently limited by the dualistic limitations of our language and the geometry of space (and time) itself, so this illustration is no exception. Below are comments on the five “stages” of the overlap and reunification of what never was separate in truth, but only in our shadowy self-imprisoned “cave thinking” of apartness.

  1. We symbolically seem apart, and our “sphere of awareness” is limited to a separate self, and we don’t believe we share anything with anyone else; this is the state of perpetual war that is fundamental to all dualistic thinking.
  2. The barely overlapping circles depict that there is now a glimmer of realization that we’re not alone. We’re all “fighting the same hard battle,” but we gain hope, solace, and inspiration from the occasional breakthrough moments when we realize we do indeed share the same interest in “going home” to the Oneness we never left in Truth. We’re mostly “asleep,” dreaming of being exiled from the peace of true connection, but now we have instants of sanity that motivate us to consider our thoughts of interconnectedness and sameness as vital to our real progress.
  3. This “midpoint” example geometry is known as the “vesica piscis” (and other names like mandorla or almond), where the center of one circle touches the circumference of the other. This might represent a halfway point in our journey from separate interests to shared interests, from insanity to sanity, from duality to unity. There are many references to the vesica piscis on this website.
  4. The fourth image brings to mind moments just before or after a total eclipse; the antithesis of the second phase, this would be akin to having a mind that now defaults to seeing shared interests instead of separate interests, where we choose sanity most of the time instead of on rare occasions.
  5. The fifth stage of total overlap requires explanation in that the two circles have “melted into one,” and there are no differences detectable. Because there aren’t any obvious examples in our everyday world, this symbol merely attempts to represent a state where time and space have been transcended. In the eclipse example, light is diminished by one shape occulting (hiding) another, yet in the mental metaphoric realm, the opposite is true: the unlimited light is joined and becomes greater than the sum of its parts because there are no longer separate parts! This graphic is woefully inadequate in expressing the idea of a “oneness joined as one,” but our dualistic minds have a tough time with that, too! Not to worry!

The important “take-home lesson” of this example is that—in keeping with the Platonic idea that symbols are not sources—as we expand our definition of Self (as a circle of infinite diameter would embrace all), the idea of an “other” self (equally expanded to embrace totality) would be indistinguishable and resolve all differences, conflicts, polarities, uncertainties, loneliness, and fear. For more about non-duality, my other blog may be helpful, particularly this post.

“As nothingness cannot be pictured, so there is no symbol for totality.” (ACIM, T-27.III.5:1)

circle overlap symbols (sacred geometry)

Filed Under: 2D Geometries, sacred geometry art, sacred geometry metaphysics

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GeometryCode: Recommendations

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Astro-logix - a unique system of glow-in-the-dark hubs and day-glow cylinders to make a phenomenal variety of 2D and 3D geometric models
Bluehost - our GeometryCode.com webhost and domain registrar offers superb customer service, technical expertise and value; tops in every respect!
Sacred geometry Jewelry Sacred geometry jewelry by artist David Weitzman Ka-Gold Related Content: Flower of Life, Seed of Life, Golden Spiral, Fruit of Life, Vesica Piscis, Star tetrahedron "Merkaba", Fibonacci Whirling Squares Spiral "Phi", Metatron's Cube, Chambered Nautilus, Labyrinth, Torus Tube, Tetractys, Sri Yantra mandala, Tree of Life, Hexagram (Star of David).
Fractiles Fractiles - Versatile geometric toys made of magnetic diamond shaped tiles
emWave Desktop Heartmath - Biofeedback using the heart's mathematics of interconnection
SacredGaiametry
Iconnect
Metaforms - chrome, bronze and gold-plated geometric pendants, 3D forms and more
Folding Circles - Books, Videos and Supplies - by Bradford Hansen-Smith
RedHen Books and Toys
Unique, hard-to-find educational materials, toys and books such as Bradford Hansen-Smith's circle folding videos, books and supplies.

ZomeTool Zometool - my favorite 3D creative tool/toy system. I use mine for demos and exploration.
More details on our complete list of affiliates; thanks for supporting us by using these links!

Disclosure: If you use our links to purchase featured products and services, we receive compensation from these companies (at no extra cost to you). We select on the basis of excellent performance and value, and, as much as possible, from our own use and testing. We're independently owned. Opinions expressed here are ours. We appreciate your support by purchasing from these links. The intent of this disclosure is compliance with the FTC's Guides Concerning the Use of Endorsements and Testimonials in Advertising.

Fibonacci Quarterly - Official Publication of the Fibonacci Association (since 1963)

Recent GeometryCode Posts

  • Highlights from the November Post Archives on GeometryCode.com
  • Highlights from the October Post Archives on GeometryCode.com
  • Highlights from the September Post Archives on GeometryCode.com
  • Solar System Geometry (per Martineau) Wall Calendars for 2027
  • Highlights from the August Post Archives on GeometryCode.com

Visit the archive site (authored by the late William Goldstein, a.k.a. Will Gold)
The New Invisible College - A Gateway to the Mystical Tradition of the West

The New Invisible College - Chartres-sacred-geometry.com

(Updated 14Oct2022): I recently had the good fortune to discover a website with some superb content … [Read More...] about The New Invisible College: Will Gold’s Chartres-sacred-geometry.com website


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