We measure time in cycles of the suns movements, hours, minutes, seconds and so on. Also time is distance and light speed. All the while assuming that it’s a fundamental construct of reality, a mathematical immutable law.

Humans have a love/hate relationship with the clock, if modern idioms are any indication. Time flies when we’re having fun. It drags when we’re bored. Sometimes it’s on our side; other times it’s racing against us. The perception of time is fundamental to our experience and central to virtually all of our activities.