> You know, I'm not so sure this is a mental illusion. Viewing the image 
> horrifically out of focus still shows the same effect,

Viewing it out of focus means the colours reaching your retina are actually 
differnt (because one is mixed with orange and the other with magenta).  See 
attached blurred version...

When you're viewing it *in* focus there really are the same colours coming 
to your retina that the brain interprets differently depending on what 
colours are around it.

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