In the shade it does look a warm grey, but in the sun it has more of a gold/brown tone as well.I caught a few grab shots of some stored cladding while walking past the site today. It's not as brassy in color as the renderings suggest but they do have a nice warm grey patina that looks much better than the standard drab grey.
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There was a UT story that shows the cladding being on display:^i remember looking at the pics of mock up cladding and it looked grey in a pic or two and then in all other pics it had that champagne gold tint. same for the glass, it was grey in some pics and in some it had dark bronze tint.