Underwater garden.
"A hard stony substance secreted by certain marine coelenterates as an external skeleton, typically forming large reefs in warm seas. Also, a sedentary coelenterate of warm and tropical seas, with a calcareous, horny, or soft skeleton. Most corals are colonial and many rely on the presence of green algae in their tissues to obtain energy from sunlight."
Minolta 600si Classic - 50mm f/1.4 Prime Lens - Agfa Optima 400 Colour Film (exp 03/99).
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