Deluxe Rainbow Blocks, model G3011, are an educational toy designed for use by children with cognitive and perceptual disabilities. Each of the 42 hardwood blocks in the set features a transparent plexi-glass window in the center in the shape of a triangle, rectangle, square, or half circle. Play with these blocks encourages motor skill and eye-hand coordination development and color and shape recognition. COLOR: The windows in the blocks are red, yellow, blue, or green. The blocks are natural wood.