IEEE Bushy Tree
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Sil (for Simple Illustrator) was written by Chuck Thacker (main designer of the Xerox Alto) and it was an intellectual successor of Sketchpad (along with Draw). It is a graphical object editor that allowed users to construct figures out of selectable, movable, stretchable geometric forms and text.[1]

Sil Branch
Influenced by
Xerox Alto
Sil Influenced
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Sketchpad Branch
Influenced by
Sketchpad
Sil Influenced
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