The classic puzzle game of inductive logic is back, purer and clearer than ever! Beautiful crystalline pieces in three shapes and three colors are used to build structures marked by the Moderator according to a secret rule selected from a versatile deck of options. The more structures are built, the more information players have to work with, and the closer they get to guessing the rule. Easy to adapt for cooperative play, it's also a remarkably good model of the scientific method!