 The first three forms of unified consciousness in the Kantian tradition can be expressed in terms of the notion of joint consciousness just introduced. First, unified consciousness of individual objects. This is Tye’s object unity; Bayne and Chalmers’ objectual unity is at least a related notion. The process at work here is now commonly called binding (Hardcastle 1998; Revonsuo 1999). Binding is the process of tying various features of a visual scene such as colour, shape, edges, and contours, features detected in various places in the visual cortex, together into an experience of a unified, three-dimensional object. Binding may be necessary for consciousness of individual objects but it does not seem to be sufficient. We must, it seems, also be jointly conscious of the various elements to have unified consciousness of an object. 