Imagine two different games both played with chess men on a chess board. The initial positions of both are alike. One of the games is always played with red and green pieces, the other with black and white. Two people are beginning to play, they have the chess board between them with the red and green pieces in position. Someone asks them, “Do you know what game you're intending to play?” A player answers, “Of course; we are playing No.2.” “What is the difference now between playing no.2 and no.1?” ‒ ‒ “Well, there are red and green pieces on the board and not black and white ones, also we say that we are playing no.2.” ‒ ‒ “But this couldn't be the only difference; don't you understand what ‘no.2’ means and what game the red and green pieces stand for?” Here we are inclined to say, “Certainly I do” and to prove this to ourselves we actually begin to move the pieces according to the rules of game no.2. This is what I should call moving in the immediate surrounding of our initial position.