This award winning glow in the dark sphere magically expands 12 inches in diameter and contracts to a compact 5.5 inches.
No assembly required! Math, science, and art collide in this Hoberman Original Expanding Mini Glow Sphere. This expanding universe comes with a "21 Cool Things To Do" game sheet and education booklet as well. Pull on the hubs and watch it open from 5-1/2" to 12" —increasing 10 times in volume! Push on any hub, tap it or roll it and it magically closes again. Leave the sphere in direct sunlight for one to two days to activate its "glow". Hold a mini universe in your hands!