And the winner is ...
Sara, who wrote, "I think this is a layer of (olive? veggie?) oil on water ... probably in a holographic container that is relatively flat due to clarity. The oil has been stirred to call separate circles and different sizes."
That was the closest guess, Carl said: "It is olive oil on water and I've used some holographic wrapping paper to provide the background colours!"
Carl shot this photo with a Samsung GX10 using an exposure of 1/20 sec. at f/8, ISO 100, and a focal length of 105mm.
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Life and wildlife in Madagascar