Nice! You might want to look into sphericons and oloids. There is another type of solid that rolls down hill in a specific path but I can't remember the name at the moment. Edit: Found it, they're called trajectoids. https://www.nature.com/articles/s41586-023-06306-y Edit - Some videos: https://youtu.be/fRqwYsfiME8 https://youtu.be/1OvIvxNQYP0 https://youtu.be/2lW9HznqsVY