Hexa-Sphericon: Sphericons are unique solids that roll in such way that every point on their surface comes in contact with the plane - following the path shown here with white paper. Solids from the sphericon family all have one side and two edges. Each sphericon is based on a regular polygon, with the basic sphericon derived from a square, and here- a more interesting case with more complex rolling motion - from a hexagon.

کره های گوشه دار شاید ترجمه مناسبی برای sphericons باشه. تمام نقاط این اجسام حین غلتیدن با سطح تماس پیدا میکند.

@infinitymath