When I worked at the Pitts Theology Library at Emory, there was a really cool Sol LeWitt structure right outside my office. I was really pleased with that, because I had been studying LeWitt and his "art objects" just a couple of years earlier. I don't know, I thought that was cool.
The structure was this mathematical construct made of equal-sized bricks. The base was 5x5x1, then the next level was 4x4x2, then 3x3x3, 2x2x4, and 1x1x5.
Eh, none of this is very interesting. Move along please.
EDIT: By the way, if you didn't know, Sol LeWitt just died. I should have mentioned that earlier.
Huh. I hate that thing, though I am in the process of revising that opinion upon learning that it has some geometric system and it is in no way a WTC memorial. Still looks like some kid god bored waiting on food and started playing with the sugar cubes. And this is one of those time I feel like we just could have made a reproduction.