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Smoking clover

[ITS] A display hack originally due to Bill Gosper.

Many convergent lines are drawn on a colour monitor in AOS mode (so that every pixel struck has its colour incremented).

The lines all have one endpoint in the middle of the screen; the other endpoints are spaced one pixel apart around the perimeter of a large square.

The colour map is then repeatedly rotated.

This results in a striking, rainbow-hued, shimmering four-leaf clover.

Gosper joked about keeping it hidden from the FDA (the US's Food and Drug Administration) lest its hallucinogenic properties cause it to be banned.

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smoke and mirrors
smoke-emitting diode
smoke test
display hack

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