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diff --git a/hacks/config/polytopes.xml b/hacks/config/polytopes.xml
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+<?xml version="1.0" encoding="ISO-8859-1"?>
+
+<screensaver name="polytopes" _label="Polytopes" gl="yes">
+
+ <command arg="-root"/>
+
+  <video href="https://www.youtube.com/watch?v=MKZQ5Q7QINM"/>
+
+ <hgroup>
+  <vgroup>
+   <select id="display-mode">
+    <option id="wire" _label="Wireframe mesh"
+            arg-set="-mode wireframe"/>
+    <option id="surface" _label="Solid surface"
+            arg-set="-mode surface"/>
+    <option id="transparent" _label="Transparent surface"/>
+   </select>
+
+   <select id="polytope">
+    <option id="random" _label="Random object"/>
+    <option id="cell-5" _label="5-cell (hyper-tetrahedron)"
+            arg-set="-polytope 5-cell"/>
+    <option id="cell-8" _label="8-cell (hypercube / tesseract)"
+            arg-set="-polytope 8-cell"/>
+    <option id="cell-16" _label="16-cell (hyper-octahedron)"
+            arg-set="-polytope 16-cell"/>
+    <option id="cell-24" _label="24-cell"
+            arg-set="-polytope 24-cell"/>
+    <option id="cell-120" _label="120-cell"
+            arg-set="-polytope 120-cell"/>
+    <option id="cell-600" _label="600-cell"
+            arg-set="-polytope 600-cell"/>
+   </select>
+
+   <select id="colors">
+    <option id="single" _label="Single color" arg-set="-single-color"/>
+    <option id="depth" _label="Colors By 4D Depth"/>
+   </select>
+
+   <select id="projection3d">
+    <option id="perspective-3d" _label="Perspective 3D"/>
+    <option id="orthographic-3d" _label="Orthographic 3D"
+            arg-set="-orthographic-3d"/>
+   </select>
+
+   <select id="projection4d">
+    <option id="perspective-4d" _label="Perspective 4D"/>
+    <option id="orthographic-4d" _label="Orthographic 4D"
+            arg-set="-orthographic-4d"/>
+   </select>
+
+   <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
+
+  </vgroup>
+
+  <vgroup>
+   <number id="speed-wx" type="slider" arg="-speed-wx %"
+           _label="WX rotation speed"
+           _low-label="-4.0" _high-label="4.0"
+           low="-4.0" high="4.0" default="1.1"/>
+
+   <number id="speed-wy" type="slider" arg="-speed-wy %"
+           _label="WY rotation speed"
+           _low-label="-4.0" _high-label="4.0"
+           low="-4.0" high="4.0" default="1.3"/>
+
+   <number id="speed-wz" type="slider" arg="-speed-wz %"
+           _label="WZ rotation speed"
+           _low-label="-4.0" _high-label="4.0"
+           low="-4.0" high="4.0" default="1.5"/>
+
+   <number id="delay" type="slider" arg="-delay %"
+           _label="Frame rate" _low-label="Low" _high-label="High"
+           low="0" high="100000" default="25000"
+           convert="invert"/>
+  </vgroup>
+
+  <vgroup>
+   <number id="speed-xy" type="slider" arg="-speed-xy %"
+           _label="XY rotation speed"
+           _low-label="-4.0" _high-label="4.0"
+           low="-4.0" high="4.0" default="1.7"/>
+
+   <number id="speed-xz" type="slider" arg="-speed-xz %"
+           _label="XZ rotation speed"
+           _low-label="-4.0" _high-label="4.0"
+           low="-4.0" high="4.0" default="1.9"/>
+
+   <number id="speed-yz" type="slider" arg="-speed-yz %"
+           _label="YZ rotation speed"
+           _low-label="-4.0" _high-label="4.0"
+           low="-4.0" high="4.0" default="2.1"/>
+  </vgroup>
+ </hgroup>
+
+  <xscreensaver-updater />
+
+ <_description>
+The six regular 4D polytopes rotating in 4D.
+
+Inspired by H.S.M Coxeter's book "Regular Polytopes", 3rd Edition,
+Dover Publications, Inc., 1973, and Thomas Banchoff's book "Beyond the
+Third Dimension: Geometry, Computer Graphics, and Higher Dimensions",
+Scientific American Library, 1990.
+
+https://en.wikipedia.org/wiki/Hypercube
+https://en.wikipedia.org/wiki/Tesseract
+https://en.wikipedia.org/wiki/Regular_polytope
+
+Written by Carsten Steger; 2003.
+  </_description>
+</screensaver>