Doing with Images makes Symbols (Part 1) | Alan Kay

In this 1987 lecture by Alan Kay on Communicating with Computers, he takes a tour through the history of computer interface design, covering Sketchpad, the "Mother of All Demos", the RAND Tablet, and Smalltalk. It was sponsored by Apple. This video was sourced from: https://archive.org/details/AlanKeyD1987 The audio's phase was corrected (left channel flipped) and the loudness normalised (+16dB).