 Bacon’s approach to vision and perception, however, is not an exercise in modern mathematical optics. It should be seen as the sketch of a physics of light as the basis for a philosophy of perception and mind. The account of visual perception in terms of natural philosophy, medicine, and philosophy of mind is found in Parts one and a section of Part two. The account of Perspectiva sets out a consideration of direct, reflected, and refracted rays, and at the end of Part three concludes with the application of geometrical models for moral and religious considerations. The analysis of natural vision provides analogies and descriptions for an understanding of divine influence.