These special transparent, rainbow-colored building bricks snap together easily to form beautiful towers that glow when light shines through them. A clear plastic base provides the foundation for the 84 interlocking pieces, which come in a mix of shapes--square, curved, and triangular--and which include two cars and two drivers. Place your Prism Brick creation near a sunny window or table lamp, or atop any of the Prism Light Centers (sold separately) and watch them gleam in rainbow hues. Prism Bricks are the perfect size for preschoolers and are fully compatible with other preschool bricks.