Alan Kay: Doing with Images Makes Symbols [video]

Dang, Alan Kay's old talks are so amazing.

Check out this Smalltalk program written in 1975 by a 12-year-old girl.

https://www.youtube.com/watch?v=p2LZLYcu_JY&t=2274s

The video shows Sutherlands Sketchpad from 1963, I highly recommend looking in the related thesis for more details on how it works.

Technical report of the thesis: https://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-574.pdf