Folded and burned, found on the street.
From the archives: a beautifully-made paper pulp beater.
Slow but fascinating, via AFC.
Fantastic diagrams from “Specification And Prelimary Design Of An Array Processor” by D.L. Slotnick and Marvin Graham, a 1975 paper describing what would have been a $10 million computer (in today’s dollars). Below is a selection of my favorites, mostly the most abstract and wonderfully geometric ones (diagrams whose function, I admit, I mostly have no clue about). Lots more after the break (and in the full PDF).