Window as a motif in Avant-gard art

Hi,

Window was a popular subject in art history in general and was, symbolically and visually, treated differently according to the period. Since Alberti's stated that a (framed) painting should be treated as a window on the world, I'm guessing a lot of Avant-garde artist who dealt with this subject had a different approach, following the general idea of breaking up with the tradition.
What do you think or know about the meaning behind windows in Avant-garde art?

Please help.

I didn't find the right solution from the Internet.

References:
 www.wetcanvas.com/forums/showthread.php?t=1436888
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Thanks