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+<?xml version="1.0" encoding="ISO-8859-1"?>
+
+<screensaver name="penrose" _label="Penrose">
+
+  <command arg="-root"/>
+
+  <video href="https://www.youtube.com/watch?v=atlkrWkbYHk"/>
+
+   <hgroup>
+    <vgroup>
+     <number id="delay" type="slider" arg="-delay %"
+             _label="Frame rate" _low-label="Low" _high-label="High"
+             low="0" high="100000" default="10000"
+             convert="invert"/>
+
+     <number id="ncolors" type="slider" arg="-ncolors %"
+               _label="Number of colors" _low-label="Two" _high-label="Many"
+               low="1" high="255" default="64"/>
+    </vgroup>
+    <vgroup>
+     <number id="size" type="slider" arg="-size %"
+              _label="Tile size" _low-label="Small" _high-label="Large"
+              low="1" high="100" default="40"/>
+
+     <boolean id="ammann" _label="Draw ammann lines" arg-set="-ammann"/>
+     <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
+    </vgroup>
+   </hgroup>
+  
+
+  <xscreensaver-updater />
+
+  <_description>
+Quasiperiodic tilings.
+
+In April 1997, Sir Roger Penrose, a British math professor who has
+worked with Stephen Hawking on such topics as relativity, black
+holes, and whether time has a beginning, filed a
+copyright-infringement lawsuit against the Kimberly-Clark
+Corporation, which Penrose said copied a pattern he created (a
+pattern demonstrating that "a nonrepeating pattern could exist in
+nature") for its Kleenex quilted toilet paper.  Penrose said he
+doesn't like litigation but, "When it comes to the population of
+Great Britain being invited by a multinational to wipe their bottoms
+on what appears to be the work of a Knight of the Realm, then a last
+stand must be taken."
+
+As reported by News of the Weird #491, 4-Jul-1997.
+
+https://en.wikipedia.org/wiki/Penrose_tiling
+https://en.wikipedia.org/wiki/Tessellation
+
+Written by Timo Korvola; 1997.
+  </_description>
+</screensaver>