What is this close-up picture? (WotsThat: Seashell spiral interior)

Question

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

IchorDrop · Accepted Answer

Seashell spiral interior. The spiral chambers inside nautilus shells follow the same mathematical pattern (called a logarithmic spiral) that shows up in galaxies, hurricanes, and even the arrangement of seeds in sunflowers—yet the nautilus "invented" this design millions of years before humans discovered the math behind it. Each new chamber the nautilus builds is precisely 5% larger than the last, a ratio so efficient that engineers have studied it to design better submarines and aircraft wings.

Answer: Seashell spiral interior

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