 This distinction between unified consciousness of individual objects and of multiples of objects corresponds closely to two kinds of synthesis distinguished by Kant (1781/7, First Division, Book 1, Chapter 2). Kant distinguishes between the kind of acts of synthesis needed to attain consciousness of individual objects and the kind of acts of synthesis needed to attain consciousness of a number of objects at the same time as a single array of objects experienced by a single subject (Brook 1994: 123). He builds his argument for necessary causal connectedness on the latter.