I have seen this sculpture on the internet, but I didn't know that some day I would drive right by it! It's located at the border between Seattle, WA and Vancouver, BC. (I vacationed in Vancouver recently.) The art is by the U.S. firm Lead Pencil Studio. I found this explanation of the piece:
"Borrowing the effectiveness of billboards to redirect attention away from the landscape... this permanently open aperture between nations works to frame nothing more than a clear view of the changing atmospheric conditions beyond."If you want to see better photos of this amazing structure, google non-sign II or check out this person's blog.