This has happened to me several times now, where I see something in a picture after the fact, now more obvious, that I totally missed on location. The increased resolution of cameras and ease of enlarging pictures sure makes things more interesting... I'm not saying someone else wouldn't have noticed how the brick design was done on the spot, but from the distance I was at I just jumped to the conclusion that they were using slightly different color bricks on a flat wall. Neat design.
The front of the building is glass and the east side has a copper facade. I found some construction photos showing other sides of the building here.