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不要worry this is normal! Our brain starts to adjust to sensory input after we’ve been getting the same signal for a while (eg when you stop smelling a bad smell after a while even though the smell is still there) but when that signal changes (like when you switch what color you’re looking at from pink to white) the brain has to readjust to a different input for a few seconds (so you see green on top of white for a little bit). Totally normal :) It’s scientific name is “physiological afterimage” and it’s behind some cool optical illusions. You can read about them here:http://mesosyn.com/mental8-15.html