[Ziobrop]

Originally Posted by Metalsales

The two tones of glass are because some are vision area and the others are spandrel glass with a backpan behind it. Usually at floor slabs are Or where interior partitions come into the glass.

A lot of new buildings are also using shadow boxes. Basically it is where you use the same glass units everywhere, but in the places backpans are, you put an aluminum sheet I front of the insulated backpan, giving a shadow look in those locations

from the backside: