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Perception and Idealism takes up two long-standing philosophical problems: how perception makes objects manifest to us, and what the world must be like for objects to be manifest in that way. Part I addresses the nature of perception. A detailed discussion of contemporary versions of naive realist and of intentionalist theories is provided, and refutations offered of both. Robinson argues that sense-datum theory is not subject to any of the vices normally attributed to it, but in fact allows one to say that we directly perceive objects as being the way that they naturally manifest themselves to creatures like us. The sense-datum theory can be reconciled with a form of direct realism, once one understands properly the cognitive and the phenomenal components in perception, a relationship which intentionalist theories confuse. As perception makes us aware of objects as they manifest themselves to us, this leaves open the question of what they are like in themselves. This is the topic of Part II. A variety of realist conceptions of the material world are considered and found to be either empty or less plausible than idealism: the 'powers' conception of matter, Lewis's quiddities, Esfeld's 'matter points', and quantum theory. The problem of giving a realist account of space is also developed. Turning to mentalist options, simple phenomenalism and panpsychism are discussed and rejected. Robinson concludes that Berkeley's theistic phenomenalism, or idealism, is the most plausible account.