piecewise(6x) on Linux
The text f0b757d1197a, as Debian 5.0 (Lenny) shipped it.
lots of moving circles intersecting in interesting ways.
Flags it lists
-
-colorspeed -
-count -
-db -
-delay -
-maxradius -
-minradius -
-ncolors -
-no-db -
-root -
-visual -
-window