<xscreensaver-updater />
<_description>
-
-This shows one of the six regular 4D polytopes rotating in 4D.
+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