Endless Non-Repeating Math.

TL;DR
Mathematicians have been searching for aperiodic tilings of the plane that cannot have translational symmetry. A breakthrough occurred in the 1970s with the discovery of the famous two-tile set called Penrose tiles. Recently, David Smith discovered the first known aperiodic monotile called the "hat," which was verified by researchers Craig Kaplan, Chaim Goodman-Strauss, and Joseph Samuel Myers. The hat tile comes together to form larger, regular structures, which can be used to understand how it tiles the plane.
Math That Goes On Forever but Never Repeats Quanta Magazine
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