This is a useful cd rack and easy to build. 1: Make two 18x18 layers of flat plates. 2: Make this with blocks of 3 in height and 1 in width. 3: Add another layer on it, with flat plates with 1 in height and 1 in width. 4: Add plates of 1 in height and 2 in width like this. 5: Repeat this as many times as many CD's you want it to hold. End with a block layer, not a 2-width-plate layer. 6: Place two flat layers on top. 7: Insert CD's.