THE NATURE OF VISION
(i) Visual images are thin films emanating from the surface of objects.
(ii) Some images are formed by the combination of films from different objects.
(iii) They are emitted and travel very fast.
(iv) Vision is a form of touch, resulting from the impact of these images on the eyes.
(v) How images are reflected by mirrors.
(vi) Optical weakness and illusions.
(vii) These cannot be used to discredit sensation, which is the only possible foundation for belief.