<command arg="-root"/>
- <video href="http://www.youtube.com/watch?v=KJWe4G4Qa1Q"/>
+ <video href="https://www.youtube.com/watch?v=KJWe4G4Qa1Q"/>
<hgroup>
<number id="delay" type="slider" arg="-delay %"
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
+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>