I am a bit reluctant to post this after looking at the Gallery and seeing a similar stairs/shadow shot by Saganich, which I like better by the way. But then why not go with a theme.
As far as yours goes, the single W poking out from behind the building and echoing the shadows on the steps really tips the scales for me. (Hopefully you got to see Bernd and Hilla's show!)
Thanks for the comments. I am not familiar with their work, but after exploring the net a bit and seeing some great industrial images, I regret that I did not have a chance to see their exhibit. Being a gear-head I would be all over it.