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Horicon Marsh, Dodge County, Wisconsin (USA) https://en.wikipedia.org/wiki/Horicon_Marsh
I don't know if these are eggs, gas bubbles, or something else. It's pond scum, growing next to a beautiful water lilly flower. Back off a little bit and it looks sort of disgusting, but up close it's interesting, even beautiful. Black pond dye makes the water dark and opaque.
Painted Lady Moth