Build Upons are awesomely tiny light up bricks that work with LEGO creations. Build Upons are made from three different types of bricks, power, bridge, and LED. The power source is plugged into the power brick, and then an LED brick that is connected to the power brick will instantly light up. The Build Upons are based on the smallest 1×1 brick we could fit an LED into to create elegant and flexible designs.