Coxeter discusses the math behind Escher's circle limit
HSM Coxeter talks about the Poincare disk model of hyperbolic geometry. For a paper discussing MC Escher's circle and square limits, see
archive.bridgesmathart.org/2016/bridges2016-179.html
with presentation slides in
www.slideshare.net/chamb3rlain/the-conformal-hyperbolic-square-and-its-ilk
This video clip is from "The Fantastic wrld. of Escher"
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