From http://www.jwz.org/xscreensaver/xscreensaver-5.22.tar.gz

[xscreensaver] / hacks / config / quasicrystal.xml

diff --git a/hacks/config/quasicrystal.xml b/hacks/config/quasicrystal.xml
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+++ b/hacks/config/quasicrystal.xml
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+<?xml version="1.0" encoding="ISO-8859-1"?>
+
+<screensaver name="quasicrystal" _label="QuasiCrystal" gl="yes">
+
+  <command arg="-root"/>
+
+  <hgroup>
+   <vgroup>
+    <number id="delay" type="slider" arg="-delay %"
+            _label="Frame rate" _low-label="Low" _high-label="High"
+            low="0" high="100000" default="30000"
+            convert="invert"/>
+
+    <number id="speed" type="slider" arg="-speed %"
+            _label="Speed" _low-label="Slow" _high-label="Fast"
+            low="0.1" high="5.0" default="1.0"/>
+   </vgroup>
+   <vgroup>
+    <number id="count" type="slider" arg="-count %"
+            _label="Density" _low-label="Low" _high-label="High"
+            low="7" high="37" default="17"/>
+
+    <number id="contrast" type="slider" arg="-contrast %"
+            _label="Contrast" _low-label="Low" _high-label="High"
+            low="0" high="100" default="30"/>
+   </vgroup>
+  </hgroup>
+
+  <hgroup>
+   <boolean id="wander"    _label="Displacement" arg-unset="-no-wander"/>
+   <boolean id="spin"      _label="Rotation"     arg-unset="-no-spin"/>
+   <boolean id="symmetric" _label="Symmetry"     arg-unset="-no-symmetry"/>
+   <boolean id="showfps"   _label="Show frame rate" arg-set="-fps"/>
+  </hgroup>
+
+  <_description>
+A quasicrystal is a structure that is ordered but aperiodic.
+Two-dimensional quasicrystals can be generated by adding a set of
+planes where x is the sine of y.  Different complex aperiodic plane
+tilings are produced depending on the period, position, and rotation
+of the component planes, and whether the rotation of the planes is
+evenly distributed around the circle (the "symmetry" option, above)
+or random.
+
+See also the "RD-Bomb", "CWaves" and "Penrose" screen savers.
+
+http://en.wikipedia.org/wiki/Quasicrystal
+
+Written by Jamie Zawinski; 2013.
+  </_description>
+</screensaver>