 Functionalism is the view that individual qualia have functional natures, that the phenomenal character of, e.g., pain is one and the same as the property of playing such-and-such a causal or teleofunctional role in mediating between physical inputs (e.g., body damage) and physical outputs (e.g., withdrawal behavior). On this view (Lycan 1987), qualia are multiply physically realizable. Inner states that are physically very different may nonetheless feel the same. What is crucial to what it is like is functional role, not underlying hardware. 