Go to www.macpaint.org for more info and a nice selection of classical artworks. I guess Ivan Sutherland's 1963
Sketchpad was a major influence on Bill Atkinson: a pioneering program that allowed users to draw and adjust lines on a monitor with a light pen!
https://www.youtube.com/watch?v=495nCzxM9PIYou can try MacPaint 2.0 (updated by David Ramsey in 1988) here https://archive.org/details/mac_Paint_2