A theory of affordances is outlined according to which affordances are relations between the abilities of animals and features of the environment. As relations, affordances are both real and perceivable but are not properties of either the environment or the animal. I argue that this theory has advantages over extant theories of affordances and briefly discuss the relations among affordances and niches, perceivers, and events.The primary difference between direct and inferential theories of perception concerns the location of perceptual content, the meaning of our perceptions. In inferential theories of perception, these meanings arise inside animals, based on their interactions with the physical environment. Light, for example, bumps into receptors, causing a sensation. The animal (or its brain) performs inferences on the sensation, yielding a meaningful perception. In direct theories of perception, on the other hand, meaning is in the environment, and perception does not depend on meaning-conferring inferences; instead, the animal simply gathers information from a meaning-laden environment. However, if the environment contains meanings, then it cannot be merely physical. This places a heavy theoretical burden on direct theories of perception, a burden so severe that it may outweigh all the advantages to conceiving perception as direct. 1 This is because direct theories of perception require a new ontology, one that is at odds with today's physicalist, reductionist consensus that says the world just is the physical world, full stop. ECOLOGICAL PSYCHOLOGY, 15(2), 181-195 Copyright © 2003, Lawrence Erlbaum Associates, Inc. Requests for reprints should be sent to Anthony Chemero, Scientific and Philosophical Studies of Mind Program, Department of Psychology, Franklin and Marshall College, Lancaster, PA 17604-3003. E-mail: tony.chemero@fandm.edu 1 Among these advantages are that direct perception is more true to phenomenology, is more realistic from an evolutionary point of view, and short-circuits traditional skeptical worries.