“ No place in the private world of one observer is identical with a place in the private world of another observer. ”
 Bertrand Russell, Mysticism and Logic and Other Essays (1910). copy citation

Context

“These belong to different spaces, although, as we shall see, it is possible, with certain limitations, to establish a correlation between them. [154] What we call the different appearances of the same thing to different observers are each in a space private to the observer concerned. No place in the private world of one observer is identical with a place in the private world of another observer. There is therefore no question of combining the different appearances in the one place; and the fact that they cannot all exist in one place affords accordingly no ground whatever for questioning their physical reality.” source