Looks like it's made out of fluffy cardboard like the old egg crates. I like the angle, you got a lot of shadows and the dark holes without actually seeing in the windows.
"A piece of toast with butter always lands butter side down, and a cat always lands on its feet. What happens if a piece of toast is tied butter side down to the back of falling cat? Does it hover above the ground in perpetual indecision?"
This looks a little like a nest of open mouths waiting for the Momma bird to come and fill them. Interesting architecture. I suppose it is intended to hood the windows and supply shade from the strong sun there.
I really like this shot - playing with the light/shadow contrast and with the black/white with the contrast of the blue sky! Nice angle too - Thanks for posting this really nice photo!