smoking clover

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.
    

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.