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If you'd like your order to arrive before Christmas, you'll need to order before the following deadlines:
Shipping to the UK: December 18th
Shipping to the US: Deadline has passed (we're still taking orders but you might not get it for Christmas!)
Shipping to mainland Europe (excluding Greece and Poland): Deadline has passed (we're still taking orders but you might not get it for Christmas!)
For all other countries, have a look at the "International Standard" table here and subtract 2 days to allow for our handling.
This is not a guarantee. Click here for more details.

Solids of constant width

Solids of constant width

£11.00


These are the 3D version of our shapes of constant width. Amazingly, they are the same width no matter how you orient them, which you'd think was only true of spheres.

You can make a solid of constant width by rotating a shape of constant width into what is called a solid of rotation. That's pretty cool but a bit boring. For this product we went back to first principles. You see, the 2D shapes of constant width are derived from odd sided polygons like the triangle, so we thought we could derive the 3D version from the 3D equivalent of a triangle, a tetrahedron. We did some research and uncovered the Meissner Tetrahedra which we proudly present here as a set of 3.

Why 3? Well if you put all 3 under a large book and roll them around the book will remain at a constant height from the desk. You won't be able to tell that they aren't spheres!

They are 35mm in diameter. Or 35x35x35mm (duh!)