Category Archives: Origami

Origami and math in the news

There was a nice little piece in the Times reviewing an exhibition on origami and fractals in LA — if I were a West Coaster, I’d definitely drop by.  As is, just posting to correct the recent deficit of origami-related material … Continue reading

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The Sonobe unit and the mathematics of origami

This post lists everything I’ve written about the mathematics of origami. Origami and math Sonobe and “underlying geometry” Update on breaking the underlying geometry Sonobe puzzler 1: Name that shape! Sonobe puzzler 2: How many units? Sonobe puzzler 3: Mirror images? Coloring … Continue reading

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Origami gallery 2

This gallery contains 17 photos.

A varied assortment of Sonobe creations.

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Coloring Sonobe origami, part 2: symmetric coloring

This is a follow-up to Coloring Sonobe origami, part 1: proper coloring. Symmetric Coloring The most natural first polyhedra to make from the Sonobe unit are, like the octahedron, regular solids. As a result, they have lots of symmetries.  Thus, … Continue reading

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Meta-origami

This gallery contains 6 photos.

Origami made from origami instructions: (The first two show a proper, symmetric 3-coloring of the octahedron with four units each of purple, teal and orange.)

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Coloring Sonobe origami, part 1: proper coloring

One thing that was on my mind while I was composing my Sonobe puzzlers [1, 2, 3] is the question of “properly coloring” a Sonobe construction: what does it mean, when is it possible, and in how many ways can … Continue reading

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Math Prize for Girls

Over the weekend I helped out at the Math Prize for Girls (which also has a blog), a relatively new math competition open only to female students of high school age (or younger).  In particular, I and my friend MG … Continue reading

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