T 2.2.8.3

This no one can doubt of with regard to our passions and sensations. But there may arise some difficulty with regard to our ideas and objects. When an object augments or diminishes to the eye or imagination from a comparison with others, the image and idea of the object are still the same, and are equally extended in the retina, and in the brain or organ of perception. The eyes refract the rays of light, and the optic nerves convey the images to the brain in the very same manner, whether a great or small object has preceded; nor does even the imagination alter the dimensions of its object on account of a comparison with others. The ques|tion then is, how from the same impression and the same idea we can form such different judgments concerning the same object, and at one time admire its bulk, and at another despise its littleness. This variation in our judgments must certainly proceed from a variation in some perception; but as the variation lies not in the immediate impression or idea of the object, it must lie in some other impression, that accompanies it.