Most famously, Ryle (1949) introduced the idea of the category mistake as a way of dispelling the confusions he thought to be rampant in the Cartesian theory of the mind, and thus of dissolving many apparent problems in philosophy of mind. According to Ryle, one makes a category mistake when one mistakes the logical type or category of a certain expression (1949, 16–17). Thus, e.g., a foreigner would make a category mistake if he observed the various colleges, libraries, and administrative offic