Watching the demos, I thought this was related to Ken Perlin's ChalkTalk, but they appear to be independent efforts. Inkbase cites Chalktalk in the Prior Art Se

Watching the demos, I thought this was related to Ken Perlin's ChalkTalk, but they appear to be independent efforts. Inkbase cites Chalktalk in the Prior Art Section it's it's definitely worth watching those videos. Inkbase, ChalkTalk, and other similar interactive tools really emphasize the "bicycles for the mind" aspect of computers. One thing that is nicer about ChalkTalk is that it cleans up the handdrawn lines by default which makes the resulting diagram look nicer. Sutherland's Sketchpad also did this and it looked mindblowing the first time I saw that.