This is an underground tunnel that runs out to United Airline's Terminal 1. It was designed by the architect Helmut Jahn in the mid-80's as the "Terminal of Tomorrow".
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I really like this image a lot because of the abstract feel and curvature of the lines, just a little to subtle on the pink to make it fit the challenge, IMO.
What a cool place to photograph! Love the lines that ebb and flow in this composition. While there is some pink in this I think it gets a bit lost in orange, white and yellow hues that are more dominant in the photo. Aside from that this is a fantastic photo - something like this would do smashingly well in a lines challenge:-).