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Physics

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    $\begingroup$ Interesting indeed! My initial response is that the direct sunlight causes the glass's own color(or that of the overlayer you describe) to 'override' the relatively weak intensity coming from the blue sky itself, thus acting like a bright but gray overlay to the scene. $\endgroup$
    – Carl Witthoft
    Commented Aug 11, 2014 at 13:41
  • $\begingroup$ @CarlWitthoft It's the most plausible answer to me, but the difference is so astonishing it seems wierd to think that the gray is just a "darker blue". Could the difference only be intensity ? now that the sky is shining at me through the window, I can see the windows are dirty, something like a dried puddle of oil (unlikely oil of course). If it is pollution chemicals, could it play some role in the process I'm trying to understand ? I'll look at the wavelengths of sky blue colour and do some research. $\endgroup$
    – PhilDenfer
    Commented Aug 11, 2014 at 14:02
  • $\begingroup$ @CarlWitthoft Turns out you are demonstrably correct. $\endgroup$
    – alemi
    Commented Aug 12, 2014 at 0:23