I just read and enjoyed this:
In February 2006, Jeff Han gave a demo of an experimental ‘multitouch’ interface, as a ‘TED’ talk. I’ve embedded the video below. Watching this today, the things he shows seems pretty banal – every $50 Android phone does this! – and yet the audience, mostly relatively sophisticated and tech-focused people, gasps and applauds. What is banal now was amazing then.