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Modern science is based on a set of rulers, which is the basis for understanding the universe. However, at the same time, this set of rulers is always limited by human observation. This leads to the following situation: From the perspective of observation alone, all contradictions such as good and bad, good and evil, high and low, beauty and ugliness are the results of observation with two human eyes. If there are intelligent creatures with four or more eyes, and their bodies do not have the abdominal and back distinctions of humans, they will not have the definition of up, down, left, and right. Secondly, there may be some rulers that are in line with the true appearance of the universe, while some standards have artificial limitations, such as the concept of time.