Ivan Sutherland operates Sketchpad running on the TX-2 computer at MIT Lincoln Labs in 1962.
Sketchpad is considered to be the ancestor of modern computer-aided design (CAD) programs as well as a major breakthrough in the development of computer graphics in general. For example, the graphical user interface (GUI) was derived from the Sketchpad as well as modern object oriented programming. wikipedia 
Ivan Sutherland demonstrated with it that computer graphics could be used for both artistic and technical purposes in addition to showing a novel method of human-computer interaction.