Think liquid metal or a blue morpho butterfly. In developing this putty, we came upon a word for blue: "hoovaloo," meaning an intelligent blue. This Gootonnuim is full of intelligent blues and a spectrum of other colors. It's beautiful to look at & satisfying to smush & stretch. This elemental stuff is a non-Newtonian matter that acts like a FLUID and a SOLID. It can also stretch, bounce, shatter, and other cool stuff. Soon I will be putty in your hands. 50 grams of glorious putty iBack to school STEM! Putty= great sensory play