Artwork in front of a window?

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One thing we forgot to mention in the house tour of Jeff Andrews' place in the June 2008 Home Magazine, was this the window in the kitchen/dining area. He placed a vintage painting in front of the window. We remembered we'd seen someone else do this before...

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In our AT:LA house tour of Deana Bracken's place, she did a similar thing with some artwork in the window in her dining room. We like the effect from the inside, but wouldn't it look weird from the outside? And we can't figure out how they were able to attatch it. Anyone else do this in their home? Any tips? Is this something you'd consider for your home?

[ image from Grey Crawford for HOME Mag and Deana Bracken ]