This nudibranch looks like it's glowing redly from within as it erupts from a blade of red algae. Actually the strobe is shining through the kelp, illuminating an opalescent nudibranch (Hermissenda crassicornis). When the surge passes and the kelp blade turns, the same nudibranch an instant later still looks like it's glowing from within -- but with white light rather than red, from the unfiltered strobe. So it's really that color, right? Well, when not illuminated by the strobe it looks pretty bland, to eyes or cameras. No doubt it looks pretty different to the underwater creatures, who have eyes that see different colors -- when they have eyes at all.
