well. I sure can't, but I'll say that the author goes into great depth in the source file, which is a literate program. It's latex, rendered here: http://intelligence.org/files/Botworld.pdf
but the author doesn't pull punches, no layman's terms are used, and as a lame man, I have trouble following.
Author here. The display library has recently been updated -- try updating and running again, it should make a bit more sense.
Also, refer to this post: http://lesswrong.com/r/discussion/lw/k5u/exploring_botworld/ for both an explanation of what we find Botworld useful for and some documentation for how to write Botworld programs and interpret displayed Botworld grids.
Can anyone explain?