Art and Geometry - H.M.S. Coxeter

"I'm engrossed again in the study of an illustration which I came across in a publication of the Canadian professor H.S.M. Coxeter, of Ottawa (whom I met in Amsterdam some time ago), A Symposium on Symmetry. I am trying to glean from it a method for reducing a plane-filling motif which goes from the centre of a circle out to the edge, where the motifs will be infinitely close together. His hocus-pocus text is no use to me at all, but the picture can probably help me to produce a division of the plane which promises to become an entirely new variation of my series of divisions of the plane."
(Escher in Locher, 1992, p. 91)