Mimicking a magnificent desert sunset, Goodnight Cactus Thinking Putty changes color with the heat of your hands. This triple change Hypercolor captures the peaceful purple, luminous orange, and radiant yellow sundown of the night sky.\nThinking Putty helps build hand and finger strength through a fabulous tactile play experience with unique, unexpected properties and provides relaxing, yet stimulating interaction for anyone with sensory integration issues.\nThinking Puttyis non-toxic, won’t dry out, and won’t leave a sticky or slippery residue on your fingers, so it’s great for stretching, molding, bouncing, tearing, popping and playing by kids and adults alike.