Isaac Newton himself suggested the use of the colour wheel, in which wedges of paper with the seven colours (red, orange, yellow, green, blue, indigo and violet) on them are pasted onto the surface of a rotating wheel. Normally a number of complete sets of colors are present.
When the disk is rotated, the colors blur together and the eye, unable to respond rapidly enough, sees the colors mixed together to form white.
Since the eye is more sensitive to colors in the middle of the visible spectrum, the wedges with yellow and green are often made narrower, while those for red and violet are made wider.
The Newton's Disk on the left-hand side appeared on a eBay auction in November 2000. It has an overall height of 65 cm, and the diameter of the disk is 31 cm. Note that the drive belt is missing.
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