The video from the 30s was fascinating. It gave a perfect progression of complexity while explaining the concept of a differential. I'd like to see more of those kind of videos (from now our from clear back then).
You might like Sheaffer's "The Twenty-Six Old Characters", c. 1947. It touches a bit on the progression of language, but it's really about writing instruments. It culminates in explaining Sheaffer's "Snorkel" mechanism, which was probably the most novel and complex pen system ever designed. I have several and love them :)
