The roof of the David L. Lawrence Convention Center in Pittsburgh has a terrace area which is only got to see on the last day I was there.  The structure has cable bracing built in to it.  Some of this is conspicuous when you are on the roof, but it also came down into some tie off points alongside the main conference levels although outside the halls.  The convergence of the cables seemed rather interesting and, while I only had the phone with me, I figured I would try and get some images that emphasized the multiple strands and their alignment.  Stuff like this is fascinating to me – like the end of a suspension bridge.  Very cool.