Things I'm looking for Books
During third grade at Shady Hill School, in Cambridge, MA, I was in a class
that got a special accelerated math class. Our "textbook" was a
paperback, 8.5 x 11 book, with (as I recall) rather nice illustrations
done in blue and green. I recall that on the last few pages, the
book discussed how far you could see (i.e., distance to the horizon)
from a spaceship 50,000 feet above the earth (using similar triangles
and the pythagorean theorem). I have the odd feeling that the book was
produced by 3M Corporation, although as I reflect on this, it seems
very unlikely.
Images
There was a pair of photos at the Museum of Modern Art in New York the last time I was there  about 15 years ago (sigh). The first showed a classroom in which someone had been teaching an art class. The teacher, using a blackboard and white chalk, had been showing how to shade various things, like a sphere, a cube, a cylinder. But s/he had used the chalk as if it were a pencil, so that the students, taking notes in pencil, could emulate it. The drawings on the board therefore looked very odd.
The second picture was a "negative print" of the first; everything in the room looked completely odd, but the drawing on the blackboard now appeared as blackonwhite, and made perfect 3D sense.
I'd like to know the photographer and the name of the work.
