These were done in 1994 for a class I was taking at Virginia Tech. The instructor was pretty laid back, so he wasn't shocked when I picked some fairly ordinary (heavily retail) places as design commentary charettes.
These almost shock me in their clarity. I remember clearly doing these and not thinking a lot about what they were, but looking at them now, I don't know if I have the kind of patience to do all that by hand anymore.
The subject matter shows I haven't changed much since 1994.
We asked this question in college all the freaking time. It became a running gag.
SouthPark isn't much like this anymore.
I was exprimenting with shading. All the cool kids were doing it.