Up to now, most learning focused on abstract symbolic knowledge like writing, or passive receptive iconic knowledge through images. But there is a third kind, ‘enactive’ knowledge, or learning by doing. It is the information we acquire using our whole bodies, and it is a new paradigm in IT-assisted education. Learning by doing, or by ‘enaction’, started at the dawn of humanity itself, from the time the first proto-human discovered that a bone could become a tool. But it is a practice that has become marginalized in developed societies, as convenience and, increasingly, technology lure people away from craftwork and physical labor.