We have seen that it is not unnatural to say: That tree is really green; it is only its distance that makes it look blue.
When one reflects upon these uses of the word "real," one recognizes the fact that, among all the experiences in which things are revealed to us, certain experiences impress us as being more prominent or important or serviceable than certain others, and they come to be called _real_.

Things are not commonly seen by artificial light; the sun is not always setting; the tree looks green when it is seen most satisfactorily.

In each case, the real color of the thing is the color that it has under circumstances that strike us as normal or as important.

We cannot say that we always regard as most real that aspect under which we most commonly perceive things, for if a more unusual experience is more serviceable and really gives us more information about the thing, we give the preference to that.

Thus we look with the naked eye at a moving speck on the table before us, and we are unable to distinguish its parts.