The original Hoberman sphere rings has linking rings of color that magically expand from 9.5 to 30". You can hang it from the ceiling and using the pulley, create an expanding mobile that you can open and close.
The original Hoberman sphere rings has linking rings of color that magically expand from 9.5 to 30". You can hang it from the ceiling and using the pulley, create an expanding mobile that you can open and close.