by damienb, published
One more Reuleaux polygons related Thing! These solids called spheroforms have a constant diameter even if they have ridges! Roll them under a book, it will stay horizontal like if it was on 'real' sphere.
Like the previous things, I've put a tutorial on how to build them with Inventor and in a parametric way with a Matlab script in http://wp.me/p3gI7M-2j . There is also a video of them in action.