We actually did a much different window wall system than is typical. We have no spandrel on this building. What you're seeing on the slab edge is a shadow box design. It's actually the same glass as the rest of the window (which is why as you mentioned, it matches so well). As a result, we'll have a much cleaner look when the building is complete.It looks like your standard window wall. Lot of mullion however, with full height panes of glass and a good job matching the spandrel at the floor slab to the vision glass.