Mediationism extends across two contrasting approaches to theory in psychology, namely, the dominant tradition of individualistic, cognitive theory, and the too loyal "opposition" consisting of various alternative approaches. Within cognitive psychology, mediationism has primarily taken the form of representationalism: the appeal to internal rules and representations as a necessary and sufficient basis for explanation within human psychology. The dualisms of matter and mind and of biology and culture are institutionalized in the very structure of modern academic disciplines. Some of the most influential current approaches within social psychology are frank extensions of individualistic cognitive theory to the interpersonal realm, and so it is hardly surprising that representationalism figures centrally in both. The curious thing about the windowless room of mediationism is that there are so many ways of getting into it. Taking note of those different ways is an important first step towards getting over mediationism.