This paper connects the debate regarding perceptual representation of high-level properties and the debate regarding non-conceptual perceptual representation. I present and defend a distinction between representationally-complex properties and properties that are simpler to represent and offer ways of assessing whether a property is representationally complex. I address conditions under which such a property might be non-conceptually represented and conclude that most representationally-complex properties are simply too complex to be non-conceptually represented. Thus, most mental states that represent representationally-complex properties must be (...) conceptual. This conclusion is relevant for a variety of philosophical theories (perception, ethics, emotions, pain) and is especially dramatic with respect to accounts according to which a mental state can non-conceptually represent such properties. As a test case for applying my argument I consider a group of such accounts: non-conceptual perceptual views of emotions, which my argument entails are false. I end by considering the implications my argument has for different theories. -/- . (shrink)