When we visited some of the 1970s 'heros' of the MIT AI Lab, we were told the informal story behind SHRDLU, the AI living in a PDP-10 3D world. How this graphical AI triggered the first AI Summer --
https://www.youtube.com/watch?v=8ZGQcJVdjj8
-- and as it fell short of first impressions, perhaps the first winter too?