Fascinating geometric sphere which expands from 5.5" to 12" with a cool glow-in-the-dark effect.
This incredible glow-in-the-dark ball expands to an impressive 12 inches with one easy motion, increasing its volume ten times over! An innovative design invented by Chuck Hoberman, the shape appears to expand just like magic. Spin it, roll it and toss it, watching the glow-in-the-dark components create cool patterns. Includes a sheet of interesting activity ideas with a fascinating breakdown of the geometry involved - totally awesome!