The direct pick-up theory requires that the objective properties being perceived exist in the external object, which they do not in cases of perceptual error

Both theories suffer from an apparent inability to handle error. Science frequently teaches us that things are not in reality the way they appear to the senses. The sun, for example, perceptually appears as a small disk rather than the large sphere that it is (Descartes 1641). This perceptual experience cannot involve either the transmission of forms (since the sun doesn’t have those forms), or the “direct pick-up” of objective properties (again, those properties aren’t there to pick up). Nor co