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

Question

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

CoralDepth · Accepted Answer

Wharf wood post texture (macro). Wooden wharf posts are traditionally treated with creosote or similar preservatives because timber standing in seawater is constantly attacked by marine borers like shipworms, which can hollow out untreated wood within years.

Answer: Wharf wood post texture (macro)

More man made close-ups