> If you do even see the four rectangles within the top row of both - the
> shadow and highlight box - your are either lucky with your equipment or
> a quite rich person who has spend a lot of money for your display ;)

And extremely good eye-sight!  The difference between grey level 254 and 
253 will only give a delta-E of about 0.35 (in CIELAB space), it's 
generally assumed that a delta-E of 1.0 is "just visible".  I suspect a 
lot of people who can "see" the separate boxes actually are seeing them 
because of incorrectly calibrated monitors (or viewing a cheap LCD 
slightly off axis).

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