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RedHat 9 (Linux i386) - man page for crystal (redhat section 1)

XScreenSaver(1) 					      General Commands Manual						   XScreenSaver(1)

crystal - kaleidescope.
crystal [-display host:display.screen] [-visual visual] [-window] [-root] [-grid] [-no-cell] [-centre] [-nx number] [-ny number] [-count number] [-delay number] [-ncolors number]
Moving polygons, similar to a kaleidescope (more like a kaleidescope than the hack called `kaleid,' actually.)
-visual visual Specify which visual to use. Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual. -window Draw on a newly-created window. This is the default. -root Draw on the root window. -grid | -no-grid Whether to draw grid. -cell | -no-cell Whether to draw the cell. -centre | -no-centre Whether to center on screen -nx number Horizontal Symmetries. -10 - 10. Default: -3. -ny number Vertical Symmetries. -10 - 10. Default: -2. -count number Count. -5000 - 5000. Default: -500. -delay number Per-frame delay, in microseconds. Default: 60000 (0.06 seconds.). -ncolors number Number of Colors. Default: 100.
DISPLAY to get the default host and display number. XENVIRONMENT to get the name of a resource file that overrides the global resources stored in the RESOURCE_MANAGER property.
X(1), xscreensaver(1)
Copyright (C) 2002 by Jouk Jansen. Permission to use, copy, modify, distribute, and sell this software and its documentation for any pur- pose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. No representations are made about the suitability of this software for any pur- pose. It is provided "as is" without express or implied warranty.
Jouk Jansen. X Version 11 XScreenSaver(1)