light pen
Pen-shaped input device that detects light from a screen to let users point and draw, enabling direct graphical interaction with computers.
1 milestone
Sketchpad Demonstrated by Ivan Sutherland at MIT
In 1963, Ivan Sutherland at MIT's Lincoln Laboratory developed Sketchpad, a computer programme that allowed a user to draw and manipulate geometric figures directly on a screen using a light pen, establishing foundational concepts for interactive computer graphics and graphical user interfaces.