Either I consider myself as within the world, inserted into it by my body which is beset by casual relations, in which case 'the senses' and 'the body' are material instruments which have no knowledge of anything; the object throws an image on to the retinas, and the retinal image is duplicated in the optical centre by a second image, but all this consists of nothing but things to see and nobody who sees, so that we are thrown back indefinitely from one bodily stage to another, conjecturing within man a 'little man', and within him a Ibid.,.