IV. Three Epochs of Childhood

Almost all our knowledge based on observation teems with unrealities of this kind. This is why Nature Study has become completely abstract, although this is partly justified, as with the theory of relativity. Anyone, however, who can think in a realistic way cannot allow abstract concepts to run on and on, but notices when they cease to have any relationship with what is real. This is something he finds painful. Naturally you can follow the laws of acoustics and say: When I make a sound, the transmission of this sound has a definite speed. When I hear a sound anywhere, at any particular place, I can calculate the exact time its transmission will take. If now I move, no matter at what speed, in the direction the sound is travelling, I shall hear it later. Should my speed exceed the speed of the sound I shall not hear it at all; but if I move towards the sound I shall hear it earlier. The theory of relativity has its definite justification. According to this, however, we can also come to the following conclusion: If I now move towards the sound more quickly than the sound travels, I shall finally go beyond it, so that I shall hear the sound before it is made! This is obvious to anyone able to think realistically. Such a person also knows that logically it is absolutely correct, wonderfully thought out, to say that a clock (to take the famous comparison of Einstein) thrown with the speed of light into universal space and returning from thence, will not have changed in any respect. This can be wonderfully thought out. But for a realistic thinker the question must necessarily arise: What will the clock look like on its return? for he does not separate his thinking from reality, he remains always in the sphere of reality.