From the YT Desc:

http://www.ted.com Legendary designer Philippe Starck -- with no pretty slides behind him -- spends 18 minutes reaching for the very roots of the question "Why design?" Along the way he drops brilliant insights into the human condition; listen carefully for one perfectly crystallized mantra for all of us, genius or not. Yet all this deep thought, he cheerfully admits, is to aid in the design of a better toothbrush.

Edit Updated with Direct TED link. Try it full screen.
http://www.ted.com/index.php/talks/view/id/197