Sketchpad
Early interactive computer graphics program that let users draw with a light pen, pioneering GUI concepts and human-computer interaction.
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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.