在我们看来，宇宙万物皆是永恒变化的，所以我们产生了时间的概念。通过时间，我们可以研究事物的变化。然而，关于时间的本质，还有待我们进一步探究。

时间流动是真实还是错觉？
之所以有些人认为时间流动是错觉，是因为当人们停下来思考时，无法理解时间流动究竟意味着什么。我们常说时间就像河流一样流动，这样的意思是河流的水在某一时刻处于与前一时刻不同的地方。换言之，水相对于时间移动。然而，时间并不能随着时间而流动，时间就是时间。 很多人误以为时间不流动就是意味着没有时间，时间不存在。然而，这是无稽之谈。时间当然存在，我们用时钟来测量它。时钟不是测量时间的流逝，而是测量时间的间隔。在事件之间存在时间间隔，这就是时钟所测量的。

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