The Arches, Ningau Island. Tunicate detail -- didennum rolle for you biologists. These little guys seem to be just a thin, flexible membrane over some central element. The dark area at the upper right is the opening, which would be circular if the water were still. These things sway with the current in a way calculated to tantalize the macro photographer (that would be me) who's trying to work with maybe a 1/16 inch depth of field while dealing with the same (but inevitably out-of-phase) current and surge as the tunicate.

Nikon F4, 105mm Nikkor f/2.8 Macro lens, 2x extender, Aquatica Housing, 2 Ikelite 200 strobes, f/32, Kodak Royal Gold 100.

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