Wittgenstein's critique of private language in the Philosophical Investigations does not attempt to refute the possibility of a private sensation-language, let alone in any one argument, as has often been thought.Nor does it aim to establish that language is intrinsically social.Instead, PI §§243–315 presents a series of arguments, suggestions, questions, examples and thought-experiments whose purpose is to undermine the temptation to think of sensations and perceptual experiences as private objects occupying a private phenomenal space.These themes are clear developments of Wittgenstein's earlier critique of sense-datum theories (1929–1936) and his insight that naming is more complex than he had assumed in the Tractatus.