This is an ingenious construction system that stimulates children's creativity while it teaches simple mechanics. Children will have fun exploring ways to combine the colorful variety of pieces - square plates interlock easily to form flat or 3-D structures. Meshing gears creates exciting movement in a spectacular chain reaction. Each gear is decorated with a different design that simulates color perception and recognition. KALEIDOGEARS has no small parts and is made of soft， washable plastic， totally safe and unbreakable.