The Hoberman Mini Sphere - Firefly Glow is an awesome stress relief toy. This glow-in-the-dark ball expands from 12.7cm to 30.5cm with one easy motion. Physical therapists and yoga educators have told us that it works as a great visual to demonstrate breathing exercises by trying to match the inhale with the expansion of the sphere and the exhale with the collapse. This gives a nice visual for kids to slow down their breath, relaxing the nervous system. The sphere can be used for other fun things too like rolling, looking for shapes within the connecting lines and many other creative games.
This is the original mini transforming sphere from Hoberman.