Just for fun, I enjoyed seeing this and thought it might be interesting to post here too.
Grand Central Terminal, NYC, January 29, 2011, ~12:30 PM. They were shooting a commercial for AT&T.
In each of the three open areas high above the floor, there was a searchlight-sized lamp shooting away from the floor, through a diffusion panel onto a massive white fabric reflector - maybe 50' (15 meters) square or more. These three enormous reflector panels were lighting the scene taking place down on the floor on the far side of Grand Central's main concourse.
A wide shot of the 3-story high "softboxes"
I didn't think to shoot a properly exposed (or even closer) shot of the lights and panels, so here's the best edit I could create to show some detail:




