I guess you'll agree there's something wrong with the reflection on the 
left side...

Although artificially constructed, this scene may serve to showcase how 
raytracing computations can go wrong when ignoring gamma issues.

Left side was rendered with POV-Ray 3.6 with default settings (i.e. 
without any gamma handling), right side was rendered with POV-Ray 3.7 
defaults (i.e. full-fledged gamma handling); the only difference between 
the scenes is in the brightness of the truly-grey squares, to roughly 
preserve the percieved contrast to the black-and-white-striped squares 
as seen on the unreflected plane (just as you would have to overhaul a 
legacy scene if you want to render it with full gamma handling).

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