Einstein:
"Physical concepts are free creations of the human mind,
and are not, however it may seem, uniquely
determined by the external world. In our endeavour to
understand reality we are somewhat like a man trying to
understand the mechanism of a closed watch. He sees the
face and the moving hands, even hears it ticking, but he has
no way of opening the case.
If he is ingenious he may form some picture of the mechanism
which could be responsible for all the things he observes,
but he may never be quite sure
his picture is the only one which could explain his
observations. He will never be able to compare his picture
with the real mechanism and he cannot even imagine the
possibility of the meaning of such a comparison."
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