Gömböc—The Shape That Shouldn't Exist. GÖMBÖC : l'objet LE PLUS STABLE DU MONDE. Incredible Rolling Objects which aren't Spheres! The ANTI OLOID is one weird shape. Orbiform: A mathematically perfect solid of constant width. PentaOrbiform: Mathematically perfect solid of constant width. The Superegg: A 1960s design icon reborn. The Sphere, Orbiform & PentaOrbiform, Solids of Constant Width Demonstration. Shapes and Solids of Constant Width - Numberphile. Explaining Shapes Of Constant Width. My Super Sphericon Collection with Astrolabicon Puzzle. HexaSphericon: Rolls Smoothly Like a Ball With a Twist. Sphericons Roll in a Wibbly Wobbly Way.