What is this close-up picture? (WotsThat: Shelf wood texture (macro))

Question

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

PeatBogger · Accepted Answer

Shelf wood texture (macro). Plywood shelving is often stronger across its span than solid wood of the same thickness, because its layered grain runs in alternating directions, spreading stress more evenly than wood with grain running only one way.

Answer: Shelf wood texture (macro)

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