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This picture shows Atkinson playing around with "splines," curves defined by a few draggable control points. QuickDraw didn't end up using splines, but the picture is still notable for the first appearance of the "knobbie" (a small, draggable, rectangular affordance for a point).
Credit: Photos courtesy Bill Atkinson. Captions adapted from Andy Hertzfeld's book "Revolution in the Valley."
Time line: Three decades of Apple innovation The products, people and events that shaped the Mac maker.
Gallery 1: Early fonts, graphics Historic Polaroids chart evolution of the user interface.
Gallery 2: Radical shift Soft-key based UI becomes mouse/windows-based.
Gallery 3: Lisa desktop Creating double-click, menu bars and more.
Gallery 4: Sketching out the Mac Before MacPaint there was LisaGraf.
Postcards from the faithful What Apple products mean to CNET News.com readers.
Cult of Mac Apple devotees have a style all their own.
Do you use a Mac? How about an iPod?
Wozniak on early Apples Company co-founder talks about building computers with cheap parts.
'It was like working at Disneyland' Former Apple evangelist Guy Kawasaki on the company's early days.
Sizzle may be subjective, but Apple's definitely got it, says CNET News.com's Charles Cooper.
Editors: Leslie Katz, Scott Ard
Copy editors: Edward Moyer, Jennifer Guevin
Production: Bernie McGinn, Andrew Lottmann
Design: Michelle White, Ellen Ng