This clever but simple game uses familiar objects and activities to help children understand how their actions can change things from one state to another. For example, one puzzle card shows a wooden fence, another shows someone with a paint brush, and a third card shows the original fence painted in a new colour. Other puzzles feature, cooking, building, repairing, etc. Each wooden card fits together for self-correction, and the set includes 10 three-piece puzzles, thirty pieces in all.