Object of Constant Width - Acorn by Anenome

Last crawled date: 4 years, 1 month ago

This is a revolved Reuleaux triangle fashioned into an object of constant-width. These can roll between two planes as smoothly as ball bearings, although it looks like it couldn't possibly.
Here's a video of how they work:
https://i.imgur.com/YpW7Cej.gifv