“[W]hen I start a project... I try to figure out what are the resources available... in terms of materiality.., energy sources, and... know-how, craft skills... [etc.] [I]t's essential that the materials... [and] energy sources are local.., particularly... human labor.., a wonderful source of energy. Whenever we think of alternative sources of energy, we think of solar, wind... [etc.,] but... the human energy is... important, and... if we don't use it, then we create a social problem. So this... is the most important energy source...”