drip.icn: Program to demonstrate color map animation

usage:  drip [-n ncolors] [-c correlation] [-d delay] [window options]

   drip uses color map animation to simulate the spread of colored
liquid dripping into the center of a pool.

   ncolors is the number of different colors present at one time.

   correlation (0.0 to 1.0) controls the similarity of two consecutive
colors.  It probably doesn't meet a statistician's strict definition
of the term.

   delay is the delay between drops, in milliseconds.  This may not be
needed; speed seems to vary greatly among different X servers, even on
the same machine.