REAL THINGS .-- And what is this _real tree_ that we are supposed to see as it is when we are close to it?
About two hundred years ago the philosopher Berkeley pointed out that the distinction commonly made between things as they look, the apparent, and things as they are, the real, is at bottom the distinction between things as presented to the sense of sight and things as presented to the sense of touch.

The acute analysis which he made has held its own ever since.
We have seen that, in walking towards the tree, we have a long series of visual experiences, each of which differs more or less from all of the others.

Nevertheless, from the beginning of our progress to the end, we say that we are looking at the same tree.

The images change color and grow larger.

We do not say that the tree changes color and grows larger.