Each ball is drawn in the same colour (brown) but it appears red, green or blue depending on which colour stripes are drawn over it.
Inspired by an image shared on twitter. (See https://twitter.com/testingham/status/1139558284631789568)
I thought i'd see if pico-8 can create the illusion even with its limited palette. The answer is: yes it can! :-)
And unlike an image, in pico-8 you can read the source code to confirm the illusion acts as stated.
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