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Bret Victor's ideas apply differently to different problem domains. This was very apparent from his talk. It looks like Chris is trying to build a platform that makes applying Bret's ideas very simple and natural. Also, I assume that many of these modes will be generalized and available out of the box, so all you have to do is the pick the one that best suits your needs for any given task.

In case anyone is wondering:

"Bret Victor - Inventing on Principle" (http://www.youtube.com/watch?v=PUv66718DII)

Thank you for the link.

Make tools to be extensions of our bodies via immediate feedback is a useful idea (it is not the main point of talk, but it stands out to me).

As a side note: It might be even be literally true for physical tools i.e., a brain can physically change to see the tool as an extension of the hand (from a study about ape, its brain, and a stick).

It generalizes them the lisp way: by building machines that build machines.