Can we imagine one lonely body, the only ball in the universe in the midst of empty space?
Perhaps. But this ball would have no energy, no motion. In relation to what could it be said to be moving?
Things are said to move only when compared with others, that are relatively still, for motion is motion/stillness.
So let’s have two balls, and notice that they come closer to each other, or get further apart.
Sure, there is motion now, but which one is moving?
Ball one, ball two, or both? There is no way of deciding. All answers are equally right and wrong.
Now bring in a third ball. Balls one and two stay the same distance apart, but ball three approaches or retreats from them. Or does it? Balls one and two may be moving together, towards or away from three, or balls one and two may be approaching three as three approaches them, so that all are in motion. How are we to decide?
One answer is that because balls one and two stay together, they are a group and also constitute a majority. Their vote will therefore decide who is moving and who is not. But if three joins them it can lick ‘em, for if all three stay the same distance apart, the group as a whole cannot move. It will even be impossible for anyone to say to the other two, or any two to the other one, “Why do you keep following me (us) around?” For the group as a whole will have no point of reference to know whether it is moving or not.
Text from: On the Taboo Against Knowing Who You Are — ALAN WATTS