This is far and away the best piece you will read on Doug Englebart, visionary dreamer of the possibilities of collective intelligence, who died two days ago at the age of 88.
I had the honor and pleasure of meeting Doug a couple of years ago. We played with his mouse prototype and talked about collective intelligence. I urged the people who were doing an oral history project with him not just to focus on drawing out what he had worked on so long ago, but his reaction to what we'd made of it since.
I wish I'd been armed with Bret Victor's perspective back then; I would have gotten so much more out of my afternoon with Doug.