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Moiré patterns from random dots: observablehq.com/@otaviocv/moi

Overlaying the same random dot pattern on a translated and rotated copy of itself shows concentric dots around the center of rotation, illustrating Chasles' theorem that every rigid transformation of the plane is a translation or rotation. (For 3d version see en.wikipedia.org/wiki/Chasles%)

The effect seems to have first been observed by Leon Glass ("Moiré patterns from random dots", Nature, 1969, doi.org/10.1038/223578a0)

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