Shimmering simulated on a drawing of rock art, would it have worked in real live?
This is a test with two complementary back&white pictures of a double spiral on C2 of the west recess in Newgrange. I got the idea from the term CAI: Complementary After-Images.
See also: http://www.iol.ie/~geniet/eng/reijs.htm#Shimmering
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