The Hoberman Sphere is an expanding and contracting ball. It cleverly combines mathematics and geometry to create a surprising motion that fascinates children and adults alike. The basic shape of the Mini Sphere is a trapezoidal icositetrahedron which is different to that of the larger Original Sphere. The structure of the Mini Sphere comprises lots of small glow-in-the-dark plastic links joined together in pairs which fold and unfold in a scissor-like motion. Grab the Mini Sphere by a link at each side, pull outwards and it will expand from 14 cm in diameter to 30 cm. Give it a slight push and it will contract back to its original size!
The Mini Sphere is rigid enough that you can throw it, kick it, bounce it and it comes with an activity sheet detailing some fun tricks and activities you can do with it.