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By George Hart for the Museum of Mathematics

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We’ve seen mathematical pencil constructions in past Math Mondays columns. (Why go to the hardware store to buy dowels with all those shiny pencils just sitting there in the office supply cabinet waiting for someone to make things with them?) Here’s a lovely new design by Cory Poole. It is a five-pointed star assembled from eighty pencils.

pencils poole 1 Math Monday: Pencil Star

There are five identical 16-pencil units around a central axis. Two units are shown below, before assembling. Each has the form of a hyperbolic paraboloid based on a four-edge cycle from a regular tetrahedron.

pencils poole 3 Math Monday: Pencil Star

If you’d like to make your own, Cory provides step-by-step construction instructions.

More:
See all of George Hart’s Math Monday columns

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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