This makes for an interesting experiment in artificial creativity. Though rather basic, and with many other factors which could be added to the simulation, it has many reasonably interesting results.
But, in the context of TRON, there is some amusement to be had. I don't know whether to see it as (somehow) adorable, or morbid.
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http://www.dvice.com/2013-4-26/run-hills-robots-have-begun-evolve