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I stared at this one for a long time: https://hidden-3d.com/index.php?id=gallery&pk=457 They use opposite colors for the foreground which makes it look opalescent and gray at the same time.

Ah the fading colours experiment! Interesting one! I'm still not grasping the efforts it takes to create those effects..

I find this effect somewhat unpleasant to look at though.