It’s going to take almost an hour of your time to watch this presentation:
Let me just say: this is sooo worth it, from the beginning all the way to the very end. No need to view it now (it’s been out for 10 months) – but when you do, you’ll enjoy it.
O n e h o u r o f m i n d b l o w i n g i n s i g h t s . . .
Bret Victor’s site is here. My fault for having seen it, but never paying proper attention.
Stumbled onto this via a related fascinating development, called CodeBook.