Highly recommended, especially once you get past the first chapter (which sounds like the musings of a college freshman, or at least that student’s favorite professor). Two things I couldn’t get out of my mind while going through this book were the quote, “Time doesn’t exist, clocks exist,” and this XKCD comic:

time travel

Related reviews include The Information, The Clock of the Long Now, 11/22/63, and The Man in the High Castle