WiddleBittyKitty
Felis catus
It's not the siding IMO. It's the awkward way they cut in the windows around what I assume are the two flights of stairs. And what's with the parallel lines that aren't exactly parallel? That seems like a real rookie mistake.
The cuts lie just below the seating in the two lecture theatres they've perched up there. Not sure what you mean by "parallel lines that aren't exactly parallel" though?
I can't see the awkwardness of the windows around the raked auditoriums either - it seems perfectly reasonable to me to express that on the exterior of the building as it helps the viewer understand better what's under the skin. Sure it's not typical, but I choose to see those gestures as more interesting, not more awkward.
…and it strikes me as funny to see it referred to as a rookie mistake. From KPMB? They're amongst the most accomplished, most celebrated architects in the country. Nothing they do isn't thought out to the nth degree. Too bad there wasn't the money to clad the building in something other than 1980s garden shed mind you…