Here’s the ninth installment of selected blog posts published in September in recent years on GeometryCode.com. Each entry below includes the post title, published month, and a sample image to entice you to review prior posts.
(This is part 9 of a 12-part series; the highlights from prior archive posts in this series are at the end of this post.)
GeometryCode.com — Highlights from September Posts (from 2011 through 2025)
- Hands-on sacred geometry workshop Oct. 8, 2011, in Castle Rock, CO
Published September 2011

- Froebel Gifts special package and Wooden Books from Red Hen (and the Wooden Books series by John Martineau)
Published September 2012

- GeometryCode bulletin for September 2013
Published September 2013
- GeometryCode bulletin for September 2014 (including More fun with Zometool)
Published September 2014

- Möbius strips of light … Donald in Mathmagic Land … Golden Ratio Nautilus
Published September 2016

- 3D Hexagonal … and other … jewelry
Published September 2017

- The Geometry Code Kindle edition: 6 years ago … Fun geometry videos
Published September 2018

- 3-D Polyhedra Software: Modeling, Art, Animation, Apps, and more
Published September 2020

- The Geometry Code (Kindle edition) turns 10 today!
Published September 2022

- 2024 Martineau Solar System Calendars available now
Published September 2024

- 2025 Martineau Solar System Calendars available now (and newly updated Tip Jar)
Published September 2025

Thanks for reviewing these highlights from GeometryCode.com’s archives!
Here are the prior archive posts in this highlight series:
- Highlights from the August Post Archives on GeometryCode.com
- Highlights from the July Post Archives on GeometryCode.com
- Highlights from the June Post Archives on GeometryCode.com
- Highlights from the May Post Archives on GeometryCode.com
- Highlights from the April Post Archives on GeometryCode.com
- Highlights from the March Post Archives on GeometryCode.com
- Highlights from the February Post Archives on GeometryCode.com
- Highlights from the January Post Archives on GeometryCode.com




























































