Peter Strawson's reduplication argument, developed in (1959, 20–22), can be construed as an argument for singular propositions. Strawson used the argument to support the related thesis that demonstrative identification is fundamental to our ability to identify and hence refer to, in speech and thought, individuals. Demonstrative identification of o is enabled by one sensibly discriminating o from other individuals. So one can demonstratively identify only individuals that one has perceived. But