What is this close-up picture? (WotsThat: Cork stopper surface (macro))

Question

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

IchorDrop · Accepted Answer

Cork stopper surface (macro). Cork is harvested from the bark of the cork oak without cutting down the tree; the bark regrows and can be harvested again roughly every nine years, with some trees still productive after 200 years.

Answer: Cork stopper surface (macro)

More plant close-ups