The Order of Time is a book by Italian physicist Carlo Rovelli, a specialist in quantum gravity research, about time in physics.

Quantum gravity seems far away from making music, and it is. The musician and the physicist are both involved in time, observing, playing with it. And if, as far as I can judge as a layman, you delve into quantum physics, you also have great love for everything that cannot be explainably and haply named and observed.

Carlo Rovelli weaves together ideas from philosophy, science and literature, end suggests that our perception of how time passes depends on our perspective and that we can learn to understand him better if we start with ourselves and our emotions, as opposed to perceiving the physical universe.