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You are here: Home / Archives for polyhedra

polyhedra

Stella Octangula projects Paul McCartney, Hendecagon architecture, Irrational Phi

Saturday, 29 August 2020 by Bruce Rawles

Hendecagon-based architecture, IndiaAnother super quick, fun update for sacred geometry enthusiasts!

  • Check out this fun, animated articulated model of Leonardo da Vinci‘s “Stella Octangula” (a.k.a. stellated octahedron or star tetrahedron – fold-up model here) making a cameo appearance as a holographic projector on a sci-fi Paul McCartney music video which seems inspired by Princess Leia’s classic hologram “Help me Obi-wan” plea.
  • The image above shows the uncommon 11-sided (hendecagon) geometry from a lovely slideshow gallery of images from this article: India’s New Parametric Temple to Reinterpret Vernacular Design in Koppur.
  • Starting with a clear explanation of how a flower might optimize seed spacing geometrically (with insightful animations) this Numberphile video shows why the Golden Ratio is so irrational.

Filed Under: 2D Geometries, 3D Geometries, polyhedra, sacred geometry animation, sacred geometry spaces, sacred geometry videos Tagged With: Paul McCartney

In memoriam: Keith Critchlow

Sunday, 31 May 2020 by Bruce Rawles

Keith Critchlow
Keith Critchlow

I recently learned of the passing of Keith Critchlow through this obituary in The Guardian. One of my first introductions – in the early 1970s – to what has become known as sacred geometry was through the books of Keith Critchlow, notably Order In Space and later, Islamic Patterns: An Analytical and Cosmological Approach. The former book has small illustrations of the tesselations (2-D tiling patterns) comprised of regular polygons. I thought these classic regular tilings all merited a full page (along with numerous archetypical variations) – so these make up a considerable portion of my first book, including pages 16-42, plus other tiling patterns inspired by these on pages 43-95, many unique to SGDS.

Here’s an example (page 27) of one of the small sketches from Prof. Critchlow’s book that I expanded and gave an entire page, in order to facilitate photocopying, coloring – for adults or “kids” of any age, arts, crafts or what have you…

You’ll note that on these 2D tesselation pages I’ve also added “unit cell” variations that show some of the possible groupings of polygon components that can make “step and repeat” (via horizontal and/or vertical translation) patterns that tile the plane in two dimensions.

Sacred Geometry Design Sourcebook example: 4 Triangle, 2 Square Grid (page 27) copyright (c) 1997 Bruce Rawles

I’m not sure if Order In Space was my first exposure to the 5 Platonic Solids and 13 Archimedean Solids, but this may be likely, and pages 196-214 in Sacred Geometry Design Sourcebook – Universal Dimensional Patterns were certainly inspired – in part – by Critchlow’s illustrations. You can find other useful tables in the back of SGDS that were also helped by the example of Critchlow’s generous offerings of useful patterns, ideas, and interconnections.

Elsewhere in Order In Space, he shows a matrix grid chart of the various possible permutations of nesting the 5 Platonic Solids inside each other. Again, these lovely little sketches seemed to merit full-page treatment, so they contributed to pages 224-229 in SGDS.

When I was nearing completion of SGDS in 1997, I sent a review copy to Professor Critchlow, and he sent a very thoughtful reply which included this testimonial:

“A valuable source book of geometric patterning, very useful data, a reminder of the supra human source of such mathematical forms.”

He also provided some very appropriate advice (which certainly aligned with my own experience) in advance of the initial publication, so I added this underlined sentence to page 5 of SGDS paying homage to what must be many millennia of geometers using straightedge and compass for discovery:

“I strongly encourage experimentation and particularly duplication with your own hand.”

Thanks for many years of inspiration, Keith!


Lots more to explore!!! In the process of researching archives online as well as my own prior work to find 2D tilings and tessellations, I found this excellent Wikipedia page: List of regular polytopes and compounds, which expands this topic into many fascinating connected subjects. Here’s a particularly lovely example image from the Hyperbolic star-tilings section:

Filed Under: 2D Geometries, 3D Geometries, Archimedean Solids, Platonic Solids, polyhedra, sacred geometry art, sacred geometry books, sacred geometry coloring books, sacred geometry news Tagged With: Keith Critchlow

Social Distancing, Space-Filling Patterns, and Non-Dual Thinking

Monday, 30 March 2020 by Bruce Rawles

In light of the current (highly appropriate) global practice of social distancing to minimize the spread of a global pandemic, the ideas and issues of space, isolation, and closeness are now in sharper focus than ever before for billions of humans on this planet. One social extreme generally considered severe punishment is “solitary confinement” where prisoners are cut off from almost all communication with others. Human examples of the other extreme might be a crowded party or bus where many of us would gasp for “breathing room” or perhaps a “dogpile” or gymnastic feat of some sort involving cramming bodies together – phone booths and VW bugs come to mind so I guess I’m dating myself with those examples. :-) Interesting how just a few short weeks can shift worldwide perception about situations involving physical proximity that we perhaps welcomed before on occasion, but now avoid – both literally and figuratively – like the plague!

Geometric Metaphors: “as close as you can get”

In the realm of geometry, we have 2-dimensional tiling patterns or tesselations where space is filled without any gaps by simple geometric archetypes. In my first book, Sacred Geometry Design Sourcebook – Universal Dimensional Patterns (SGDS), pages 16 through 84 of the 256 pages are devoted to these grids of space-filling patterns: 30 pages of regular polygon tesselations, 18 pages of square, rectangular, and circular arc tilings, 10 pages of hexagon-based or dodecagon-based tilings, and 9 pages of pentagonal tesselations, just a tiny sampling of an almost endless assortment of permutations of patterns that can fill a 2-dimensional space and not leave any gaps. Here’s an example of regular polygonal tilings from page 27 of Sacred Geometry Design Sourcebook showing a few variations (indicated by thicker lines) of “unit cell” patterns that fill space in two dimensions:

Sacred Geometry Design Sourcebook example: 4 Triangle, 2 Square Grid (page 27) copyright (c) 1997 Bruce Rawles

The classic work of graphic artist M. C. Escher brought some unique and elegant examples of tilings and tesselations to the world a few decades ago. Here’s a video with a few examples and related software for making tesselation patterns in 2D. There are countless examples of both periodic (uniform) and aperiodic (non-uniform, such as Penrose) tilings in nature, art, and architecture.

What about 3D Space-Filling Patterns (Tesselations)?

One of the most familiar examples in three dimensions of a space-filling pattern is a cubic lattice. Here’s an (Escher) example of a 3-D grid (think steel girders on a high-rise building). Although not space-filling per se and not 100% density, sphere packing takes on various geometric patterns, including Hexagonal Close Packing, and Cubic Close Packing. Page 239 in SGDS has a chart of radius ratios and diagrams for Coordination Numbers of 3,4,6,8 and 12 of spherical packing, as typified in ionic chemical bonding on a molecular level. Here’s an excerpt from that page:

Radius Ratios by Coordination Number - from Sacred Geometry Design Sourcebook (excerpt from page 239 - appendices)

Here are some of the less familiar 3-dimensional space-filling patterns. and related honeycomb geometries. … One of the more exotic classes of 3-D space-filling forms is Rhombic Spirallohedra; here’s a related fold-up pattern. Russell Towle introduced me to these amazing space-filling shapes almost two decades ago.

Rhombic Spirallohedron

So what if “close” isn’t close enough?

In our “mind’s eye” we can visualize intersecting shapes that don’t have physical counterparts in the everyday material world around us. One example might be two identical intersecting spheres where each sphere exactly touches the other at its center; we can use ray-tracing software with opacity less than 100% (partially translucent shapes) to model how these might look (see translucent spheres intersecting in Vesica Piscis cross-section rendering below)

translucent spheres intersecting in Vesica Piscis cross-section
translucent spheres intersecting: Vesica Piscis cross-section

The 2D “shadow” (or cross-sectional slice) of the imagined 3D shape would be the famous Vesica Piscis shape. This might be analogous to intersecting (colliding) spiral galaxies where their forms interpenetrate; it might be a bit chaotic in such a galactic struggle where each “PacMan” galaxy tries to absorb the other!

Check out Russell Towle’s amazing animations – each frame of these videos being a “3D slice” through a 4D polytope or 4-dimensional polyhedron… You can see how we only get a glimpse of what these 4D shapes must be like; a reminder that our senses are limited, distorted and fallible, yet can remind us to beyond them if we’re looking for the “bigger picture.”

We’re still dealing with separate identities, separate shapes, though. The great mystical traditions, along with modern physics and non-dual metaphysics suggest that – if time and space (since both are inextricably linked in the fabric of spacetime) are an illusion – or at least a woefully incomplete and inaccurate view of reality, then even identical forms inhabiting the exact same space and time in a completely congruent fashion would still be “separate” if their identities could be distinguished from one another somehow. Recent breakthroughs in quantum computing that further validate the theory of quantum entanglement – where entangled particles are synchronized (e.g. their spin axis) instantaneously, regardless of the magnitude of the space between them – give impetus to exploring this idea.

Beyond Close

A few years ago, when my wife was about to leave that morning for an extended planned work situation in another state, while she was asleep next to me in bed, I realized that I was missing her already! How could that be possible? That “Aha!” moment further propelled my renewed exploration into the mystical study and practice of non-dual metaphysics, as I realized that she – and ultimately everyone! – lives in my mind.

Let’s do what can with zoom, Skype, web, email and whatever other technologies make sense to stay connected and support each other, especially when we appear to be more physically isolated than ever while considering that – just maybe – the imagined distance between us might just be subject to reinterpretation. This mindfulness provides all the more reason for us to be kind, compassionate and generously gracious in our assessment of each other and ourselves – as ourselves. What if the mystical Oneness alluded to down through the millennia in poetry, song, and prose  – that we usually are too busy to consider – holds the effective key to not only pragmatic concerns like economic and medical infrastructure – but also to sustainable peace of mind as well? A forgiving and inclusive perspective on life would then make space (or lack thereof) a less important variable. We’re all in the same boat, fighting the same difficult battle – the silly, erroneous belief in separate interests. Sacred geometry and being mindful of clues reminding us of our interconnectedness in the world can be guideposts for the mind’s journey back to the Oneness we never left.

Filed Under: 2D Geometries, 3D Geometries, modern physics, Platonic Solids, polyhedra

3D Geodesic Animation inspiration

Friday, 31 January 2020 by Bruce Rawles

Here’s some inspiration on YouTube for anyone wanting to animate geodesic spheres: Parametric Animation in 3dsMax #morpher [ Tutorial ]

Colleague Dave Van Dyke has contributed several geometric animations that appear here on GeometryCode.com and also on my BruceRawles.ccom blog; all of which were made using 3D Studio Max.

Filed Under: 3D Geometries, polyhedra, sacred geometry animation, sacred geometry art, sacred geometry videos

Redding Geodesic Sphere

Tuesday, 31 December 2019 by Bruce Rawles

Happy 2020 everyone!

Instead of the New Year’s Eve “Ball drop,” I decided to post a photo I took a couple of months ago while traveling south on Interstate 5, near Redding, Calif., of an eye-catching geodesic sphere. Having built and lived in a (Cathedralite 39′ diameter) geodesic dome home in the late 1970s, I tend to notice geodesic domes (partial spheres), but it’s less common to see larger full spheres such as this one. Here’s an article about the sphere’s construction, and another after the sphere was completed. Here’s a link to my friend Asha’s geodesic company – Pacific Domes – in Ashland, Oregon.

Geodesic Sphere near Redding, Calif.

Filed Under: 3D Geometries, Archimedean Solids

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