According to the Jargon File
, Smoking clover
is a computer display hack
, originally created by Bill Gosper
. Several converging lines are drawn on a color monitor
in such a way that every pixel
struck has its color incremented—altered to the next hue
up or down. The color map is then repeatedly rotated.
The upshot of this is a rainbow-hued, shimmering four-leaf clover. The program has been described as "psychedelic", and Gosper joked about keeping it a secret from the Food and Drug Administration (FDA) due to its "hallucinogenic properties".