Two parts of the body, the brain and the heart, are considered to be the most important factors, for the scientist thinks that the brain thinks and the orthodox believes that the heart feels. In the view of the Sufi, both are wrong in a way and right in a way. In fact it is not that the brain thinks, but the brain is the means by which the mind distinguishes thought in its concrete form; just as the piano does not compose, but the composer tries his composition on the piano and makes it clear to himself. It is not the camera which takes the photograph, but the light and the plate. The camera is the medium for both, and so it is with the brain. By disorder in the brain, the scientist says, man becomes unsound in mind. But the Sufi holds that nothing is wrong with the mind; it is the instrument through which the mind functions that is out of order.