Rapidly Rotating Bouncing Spheres are spheres that bounce when people step on them. The spheres rotate at high speed, but when people approach them, they stop rotating and become easier to step on.

When people bounce on the spheres, the spheres shine. If they bounce on spheres of the same color in succession, the spheres will pop and particles of light spread out into the space. If people bounce on more spheres of the same color in succession, caterpillars are born. 

The caterpillars move out of the room towards the Balance Stepping Stones in a Flutter of Butterflies space. They make their way through the Balance Stepping Stones in the Invisible World, where if people step on the Balance Stepping Stones, the caterpillars nearby are blown away.