 Could a computer compose the Eroica symphony? Or discover general relativity? Or even replicate a child’s effortless ability to perceive the environment, tie her shoelaces, and discern the emotions of others? Intuitive, creative, or skillful human activity may seem to resist formalization by a computer program (Dreyfus 1972, 1992). More generally, one might worry that crucial aspects of human cognition elude computational modeling, especially classical computational modeling.