The Self-righting Tetrahedron

I came across this article and thought it would be appreciated here.
A New Pyramid-Like Shape Always Lands the Same Side Up | Quanta Magazine https://www.quantamagazine.org/a-new-pyramid-like-shape-always-lands-the-same-side-up-20250625/

And here is a paper desk l describing it.
Building a monostable tetrahedron https://arxiv.org/html/2506.19244v1

The Gömböc, another shape that is monostable.



-Will

 

Interesting, a behavior we desire to achieve when building a boat..

I like the simplicity of the tetrahedon, but I find the Gömböc more fascinating because of it's "unpredictable" shape from which one cannot see immediatly the self righting behavior.