What is this close-up picture? (WotsThat: Leather grain)

Question

What object is shown in this zoomed-in close-up photo?

MossCircuit · Accepted Answer

Leather grain. Leather grain patterns are completely unique to each hide, much like fingerprints on humans. The distinctive texture forms naturally during the animal's lifetime and is preserved through the tanning process, making every piece of leather genuinely one-of-a-kind.

Answer: Leather grain

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