Unschooling theory as read through the New York Times: "There is good reason to suppose that responsibility has to be installed in the foundation of your mental equipment — at the level of perception and habit. There is an ethic of paying attention that develops in the trades through hard experience. It inflects your perception of the world and your habitual responses to it." 

~The Case for Working With Your Hands

Also see: "Shop Class as Soulcraft"