Another interesting #domain #coloring plot. Inspired by Elias Wegert's work:
http://www.visual.wegert.com/
#mathartpic.twitter.com/5MUkrxtQUN
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because the phase portrait looks like a lambert series, you should preimage z by a modular transformation in SL(2,R)
It does look like a Lambert series. I'll try it later. 
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