Answers

2016-01-25T18:14:57+05:30
The solid-color disks are slotted, and my be overlapped, as in the case of the black/white and red/blue disks at the left. The concentric and conjoined disks may then be slid around to vary the relative amount of each color. Three disks can also be put together to produce the illusion of white when they are spinning.

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