<command arg="-root"/>
+ <video href="https://www.youtube.com/watch?v=_kTMO7oEN8U"/>
+
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_label="Frame rate" _low-label="Low" _high-label="High"
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A cellular automaton that generates loop-shaped colonies that spawn,
age, and eventually die.
-http://en.wikipedia.org/wiki/Langton%27s_loops
+https://en.wikipedia.org/wiki/Langton%27s_loops
Written by David Bagley; 1999.
</_description>