I was playing with corrugated cardboard today gluing strips together to replace a chewed up cat scratcher. I noticed how cool it was to look through the corrugations of a strip and move it around. Then I wondered what it would look like to precisely alter the angle of pieces of cardboard in a stack.
So I made this: 3" circles with a 1/2" hole rotated 10 degrees between each one.
Slid all of those onto a half inch square tube and slowly rotated. It has a definite lava lamp quality.