# Seeing, Doing, and Knowing: A Précis **Opening (not a real abstract):** I. The Sensory Classification Perspective The theoretical fulcrum of Seeing, Doing, and Knowing1 (SDK) is the Sensory Classification Thesis: Sensory systems assign distal objects to classes. For example, colour vision assigns objects to colour-classes; form vision assigns them to shape-classes; speech perception assigns sounds to phoneme-classes; and so on. A sense-feature is a property that something has by virtue of belonging to such a class. Sensory classification feeds into automated epistemic operations: for example, classical and operant conditioning (updated versions of Hume’s associations of ideas) and habituation (diminished attention to repeatedly presented stimuli). These operations allow an organism to construct and update its records concerning the state of the world. When sensory systems assign two stimuli to the same class, these **Authors:** [[Matthen]]