Each of these is about a centimetre across. They are cup corals, solitary stony polyps that do not build a reef but colonise the shaded vertical rock and cavern walls of the Pacific Northwest, and go deep.
By day they are closed orange discs. At night the translucent tentacles come out, and the colony looks lit from inside.
The picture is made with two strobes pulled forward and turned to face each other across the subject, so the polyps are lit from the sides and the rock behind them falls to black. Nothing was done afterwards; this is the file as shot. Cooper Green, Sunshine Coast, British Columbia.
A colony of orange cup coral seen side-on, lit through the polyps so they glow from within, Howe Sound.
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Eight lines from the dive
Photographed in Howe Sound
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