A new twist on building blocks!  Create three-dimensional structures with these plastic cubes with interlocking slits. Teaches basic architectural principles, proportion, balance, structure, composition and color. Dado invites visual spatial development through attention grabbing fun. Each set features 10 cubes, scaled from 1 inch to 5 inches, capable of building structures over 32 inches high!  Colorful and durable building blocks enhance spatial perception .  Ages 3+  Toy of the Year Award Creative Child Magazine. Exceptional Parent Symbol of Excellence. Dr Toy best products winner 2007.