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Photo keeps going through my TL. Put on the spot, it looks like an artifact: a manufactured defect. It may not be pcc but hot-mix asphalt, where it would be quite simple to stencil in a pattern - using a solvent you could achieve something like this - mechanically, a router... +
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The sidewalk pattern isn’t “fractal” enough - it looks like one of those creepy deepfake faces with five front teeth instead of four. Cannot infer origin of introduction of artifact - can’t be sure of pavement type. Will leave to to reveal more if ir was his experiment.
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