This picture represents the result of a conformal transformation of the complex plane tiled by a clock. Here: the inversion <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle z\mapsto 1/z}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mi>z</mi><mo stretchy="false">↦<!-- ↦ --></mo><mn>1</mn><mrow class="MJX-TeXAtom-ORD"><mo>/</mo></mrow><mi>z</mi></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle z\mapsto 1/z}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/28579de22fc73e4e5ec10651e672e7425d2d484e" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -0.838ex; width:8.115ex; height:2.843ex;" alt="{\displaystyle z\mapsto 1/z}"></span>.
Christian Mercat
I created this picture from a clock with French writing