[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.

In addition suitable contents:
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