What is this close-up picture? (WotsThat: Sea foam bubble structure)

Question

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

PrismBadger · Accepted Answer

Sea foam bubble structure. Sea foam bubbles are so densely packed that they naturally arrange themselves into a geometric pattern called a Weaire-Phelan structure, which is the same mathematically optimal shape that won an architect the Pritzker Prize when he used it to design the Beijing National Aquatics Centre. Each bubble is basically trying to minimize its surface area while sharing walls with neighbors, creating this incredibly efficient honeycomb-like pattern that nature figures out automatically, without any instruction.

Answer: Sea foam bubble structure

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