Window Pane

Here's a couple photos of a small lens (about 1" diameter) attached to a window in the Mattress Factory Art Museum when I was there a couple weeks ago.

Missing image - pane1.jpg

I'm not sure if it is a piece of "art" or if it's just something somebody slapped on the glass one day, though its location roughly centered on the pane and at eye height makes me think it was put there with intention.

Missing image - pane2.jpg

Note in both photos the large building on the right being visible both inside and outside the lens.