On Seeing

Like all painters, he suggests, he felt he knew instinctively what science was then in the process of discovering: that the eye was an entirely passive collector of visual stimuli, and that "seeing" was a learned activity that went on in different, discrete parts of the brain – the imaginative piecework of collating form, and colour, and light into an understandable vision of the world, one you constantly made up as you went along.

Tim Adams: Sargy Mann: the blind painter of Peckham
The Observer, 21 November 2010