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I knew the name sounded familiar. Bret Victor also gave a great talk called Inventing on Principle (http://vimeo.com/36579366 http://vimeo.com/36579366).

• espeed 13y ago
  If you enter through the home page, you can see a list of his other talks: http://worrydream.com/#!/InventingOnPrinciple http://worrydream.com/#!/InventingOnPrinciple
• zhemao 13y ago
  A lot of the stuff here (especially the circuit simulator) were discussed in Inventing on Principle.