[click on image to see a larger one]
Quadriptych human vision, UV, sim. butterfly vision, sim. bee vision (left to right, top to bottom):
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This rock tulip has a not so strongly visible UV pattern, its petals are UV bright, and this gets quite nicely visible in these close-ups.
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos