<command arg="-root"/>
- <video href="http://www.youtube.com/watch?v=K2lqgBPde4o"/>
+ <video href="https://www.youtube.com/watch?v=K2lqgBPde4o"/>
<hgroup>
<vgroup>
halftone dot pattern. The gravity force is calculated from a set of
moving mass points. View it from a distance for best effect.
-http://en.wikipedia.org/wiki/Halftone
+https://en.wikipedia.org/wiki/Halftone
Written by Peter Jaric; 2002.
</_description>