If you are a Tetris fan, then this light was made for you! The Tetris Constructible Light is an interlocking light that comes with 7 interlocking shaped pieces. The shapes can be stacked in endless possible combinations giving you a new lamp every day! Once the blue block is plugged in and illuminated, other blocks can be added and as soon as others come into contact with one already illuminated, they will light up as well. Multiple sets mean bigger and better color combos!