Proclus' interpretation of the Timaeus confronts the question of whether the living being that is the Platonic cosmos perceives itself. Since sense perception is a mixed blessing in the Platonic tradition, Proclus solves this problem by diff erentiating diff erent gradations of perception. Th e cosmos has only the highest kind. Th is paper contrasts Proclus' account of the world's perception of itself with James Lovelock's notion that the planet Earth, or Gaia, is aware of things going on within itself. Th is contrast illuminates several key diff erences between contemporary theories of perception and the neoplatonic world view. In particular, it argues that the neoplatonists had a radically diff erent view of these matters because they assigned the property of truth not only to representations, but to objects as well.