smoking clover

n. [ITS] A display hack originally due to Bill Gosper. Many convergent lines
are drawn on a color monitor in such a way that every pixel struck has its
color 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 color 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 U.S.'s Food and Drug Administration)
lest its hallucinogenic properties cause it to be banned.

