<command arg="-root"/>
+ <video href="https://www.youtube.com/watch?v=KJWe4G4Qa1Q"/>
+
<hgroup>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
<xscreensaver-updater />
<_description>
-This shows a rotating Clifford Torus: a torus lying on the
-"surface" of a 4D hypersphere. Inspired by Thomas Banchoff's book
-"Beyond the Third Dimension: Geometry, Computer Graphics, and Higher
-Dimensions", Scientific American Library, 1990.
-
-http://en.wikipedia.org/wiki/N-sphere
-http://en.wikipedia.org/wiki/Clifford_torus
-http://en.wikipedia.org/wiki/Regular_polytope
+A Clifford Torus: a torus lying on the "surface" of a 4D hypersphere.
+Inspired by Thomas Banchoff's book "Beyond the Third Dimension:
+Geometry, Computer Graphics, and Higher Dimensions", Scientific
+American Library, 1990.
+
+https://en.wikipedia.org/wiki/N-sphere
+https://en.wikipedia.org/wiki/Clifford_torus
+https://en.wikipedia.org/wiki/Regular_polytope
Written by Carsten Steger; 2003.
</_description>