VISION IS NOT DEPENDENT ON THE AFFECTION OF THE MEDIUM.

Here is another important (related) question. If there existed another

world and organism which had no relation with our world, and if on

the surface of the sky was an eye that was looking, would it perceive

this other world at a moderate distance, or would it have no relation

thereto? This question will be considered later.[169] Now however we

shall give a further proof that the medium has nothing to do with

vision. If the air were affected, it would experience a material

affection, similar to the figure impressed on wax. In this case, a

certain part of the object would be impressed on a certain part of the

air; and consequently, the part of the air nearest to the eye would

receive a part of the visible object, and this part would be of a

size equal to that of the pupil. Now a visible object is seen in its

entirety, and all those who are in the air equally see it, whether they

behold it from the front, or side, or whether they be one behind the

other, without however forming mutual obstacles. This proves that every

part of the air contains the entire visible object. This cannot be

explained by any corporeal affection, but by higher laws, suitable to

the soul, and to the (universal) organism which everywhere responds to

itself.

Plotinos: Complete Works, v. 2 In Chronological Order, Grouped in Four Periods · 第 271 / 381 题