In 1959, Ivan
Sutherland utilized a forerunner to today's tablet pens and one of
the computers at MIT to devise the beginnings of interactive computer
graphics. With the light pen and a control box be was able to draw on
the screen of the TX-2 computer. 'Sketchpad' supported a large number
of commands which ranged from basic to advanced, giving it a
surprising complexity for the era.
Sutherland's program
ultimately led to the vast range of digital construction programs
such as Photoshop that we have today.