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I made 2 lamps for Christmas. They are 18" tall (1/2 of 2 1/2 " Clear Plastic Pipe, Amazon $14) and the disks are 3/4" red oak plywood, one painted, one stained. The base disk is glued to the tube, and there are 24 disks (centimeters: 2x 6, 7.6, 8.8, 9.7, 10.5, 11, 11.5, 12, 12.2, 12.4, 12.5 and 12.6). I built a jig and used a table saw to cut the disks (https://www.youtube.com/watch?v=Wxbzrf4z_cg) except I drilled a holes through both disk and moving surface and used a nail for the pivot. I also bolted the square that came with the saw to the moving surface to get a runner to allow the surface to move square on the saw.