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By George Hart for the Museum of Mathematics

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2 layer chiral sphere Math Monday: Two layer geodesic spheres

This four inch diameter ball is a two-layer geodesic sphere. It has an outer layer of triangles connected with an inner layer of pentagons and hexagons, which is the structure of geodesic domes such as the Montreal Expo67 dome. The above design is unique, however, in that it is chiral, meaning it is different from its mirror image. If you have access to a 3D printing machine, you can build a copy of this structure from the .STL file available here.

2 layer sphere Math Monday: Two layer geodesic spheres

Without a 3D printer, you can still build complex two-layer domes from commercial plastic components, by following the instructions here.

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Gareth Branwyn

Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor for Boing Boing and WINK Books. And he has a new best-of writing collection and “lazy man’s memoir,” called Borg Like Me.


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