"You said yourself that when you stood there you perceived a large snowball on the left, far away, and a small one on the right. Here you perceive a large one on the right, near at hand, and a small one on the left. So even though the balls might be indiscernible, and hence identical, in terms of their external properties such as size, shape, and weight, when we consider their internal properties—such as their perceptions of one another—we see that they are different. So they are discernible! And what is more, they may be discerned without reference to some sort of fixed, absolute space."