Are windows to see through? To see in? To see out? Not necessarily. These windows are to sell through: windows as sales tools!
As often when I go to the liquor store, a question arises in my mind, a snatch of poetry from long ago:
And much as Wine has played the Infidel,
And robbed me of my Robe of Honor Well,
I often wonder what the Vintners buy
One half so precious as the stuff they sell.
Rubayiat of Omar Khayyam, translated by Edward Fitzgerald
Or, as humor columnist Dave Barry has said, less poetically but just as pointedly:
Without question, the greatest invention in the history of mankind is beer. Oh, I grant you that the wheel was also a fine invention, but the wheel does not go nearly as well with pizza.