Barbara Tversky: Action Shapes Thought
The Knowledge Project
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Compare and Contrast
He invented uses of sketches that weren't reinvented until many years later because his sketches were unavailable. He did a great many like that of heads and then skulls and then the brain structures inside. So there are cutaways, there are comparing contrast. You see him and this is a phrase I'm borrowing from a catalog on an exhibit of Raphael - thinking out loud. And that's what da Vinci's sketches were.
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