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Interesting pattern to explain @taricha?Check out the weird circles on the back glass. Anyone else seen this before?
That’s really interesting. I guess no crop circle story here.
@Dan_P resonance patterns can appear in all sorts of environments, and organisms can orient themselves to take advantage of the local patterns of movement. (my best guess)
I think this pattern formed in a scum surface on top of the water in a test tank, and I scooped it onto a flat piece of plastic to take a picture.