The nesting & stacking rainbow block set features 5 different rainbow blocks, 11 kinds of animals and tree blocks. Colorful, arched building blocks offer tifferent possibilities than conventional building blocks or planks. Every child love to stack or nest rainbow puzzles or use them as an open-ended toy. It can not only play stack game, but also act as scene game and balance game. The rainbow stacker will be great for creativity, imagination, pretend play and color/size/comparison recognition.