Here's a pretty cool little braintwister.
http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html
I MAY just be exaggerating here and extrapolating too far, but I think it says something about the subtle impact that tonality has in an image (for lack of a better term). What I mean is: what makes the tonal response of a sensor or of film , or or what makes a particular PP approach appealing or not is a very subtle thing. This little experiment gives a very direct indication of why this is: the mind reinterprets the actual tonal relations using rules best known to itself, so all pixelpeeping bets are off.
http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html
I MAY just be exaggerating here and extrapolating too far, but I think it says something about the subtle impact that tonality has in an image (for lack of a better term). What I mean is: what makes the tonal response of a sensor or of film , or or what makes a particular PP approach appealing or not is a very subtle thing. This little experiment gives a very direct indication of why this is: the mind reinterprets the actual tonal relations using rules best known to itself, so all pixelpeeping bets are off.