There's a long path-not-taken on housing. Most things in our society have gotten a lot cheaper per unit service in the past hundred years or so, including many entirely new categories of services. Housing has stubbornly resisted change, with the result that an ever-larger portion of our culture's capital is tied up in providing housing. And housing hasn't gotten any more useful, either.<p><a href="http://hexayurt.com" rel="nofollow">http://hexayurt.com</a> gives some notion of how radical that shift could be when it arises. Industrial panels (of whatever kind) directly into owner-build housing. Free Hardware. You may laugh, but half the world lives in cinderblock-and-tin-roof shacks and worse.<p>Nobody said the innovation had to start here, or look like what we do now.