A six-week workshop with Carl Ratner, in which we will seek to solve the riddle Marx posed in his first thesis on Feuerbach: "in contradistinction to materialism, the active side was developed abstractly by idealism – which, of course, does not know real, sensuous activity as such." Exploring a materialist theory of subjectivity which does know sensuous activity, we will see how historical materialism can be extended to reveal how it is compatible with psychology and how human psychology is itself a historical-materialist phenomenon.