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Abstract
Within the theory of relativity lies the problem of reality or unreality of relativistic phenomena related to space-time (time dilation, length contraction, break of simultaneity caused by the movement of scales and watches). The first part of this paper will outline the framework related to this controversial issue. After the framework is established some of Einstein’s mental experiments are taken into consideration to demonstrate why relativistic time cannot be characterized either as real, or as mere appearance. Throughout this critical analysis the function of the expression «as
if» plays an important role in understanding why time can be seen as an interpretation rather than a real «thing» or an «illusion».
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