Nonlinear Tessellations

Background

In Escher on Escher, Escher writes about the difficulty of comprehending the infinite.
Just like the passage of time must be punctuated by the ticking of a clock, the infinite extent of space can be perceived by dividing the "universe in distances of a specific length, in compartments that repeat themselves in endless series."
Relatively straightforward approaches, including Regular Division of the Plane III and Symmetry Work 72, were not altogether successful at capturing the infinite, because "... if only the plane on which they follow one another were infinitely large, an infinitely large number could be represented on it. However, we arenÕt playing a game of imaginings.
One possible solution, hinted in Encounter, is that "We can make a paper tube ... In this way, infinity is achieved in one direction." This approach is not completely satisfying, because of course it does not address the problem of representing the infinite along the axis of the cylinder.
"Curved Beechwood Ball with Fish gives a more satisfying solution: a wooden ball whose surface is completely filled with twelve congruent shapes. When we turn the ball around in our hands, we see fish after fish appear, continuing to infinity." But of course this is not quite the whole story: "twelve similar fishes are something different from infinitely many."
Graphically more interesting is to change the size of the pieces.
The first attempt, Smaller and Smaller, places larger fishes around the periphery of a square, with ever smaller fishes converging to the center of the square. While this gives the appearance of infinitely many pieces within a bounded region of the plane, Escher was not satisfied: "this composition also remains a fragment because we can expand it as far as we want by adding ever larger figures."
Inspired by Coxeter's picture of a covering of the Poincarˇ disc by hyperbolic triangles, Escher produced his Limit Circle pictures. Here the largest animals are in the center of the disc; approaching the boundary the animals appear to shrink till they become vanishingly small.

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