Forgive my waxing hyperbolic . . .
This is a tiling of the hyperbolic plane by triangles whose angles are π/2, π/3, π/7 – the smallest possible tile. I present it in a conformal mapping analogous to the Mercator projection, which I’ve never seen done before.
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My transformation of the drawing, in a book by Coxeter, that got Escher’s attention.
