One of the most beautiful deep-sea corals, iridogorgia, creates large spirals as it grows.
Iridogorgia
Image courtesy of the NOAA Office of Ocean Exploration and Research, Exploring Atlantic Canyons and Seamounts 2014. Download larger version (jpg, 1.5 MB).

One of the most beautiful deep-sea corals, iridogorgia, creates large spirals as it grows.

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