If nothing happened, if nothing changed, time would stop. For time is nothing but change. It is change we see occurring all around us, not time. In fact, time doesn't exist.

What really intrigues me is that the totality of all possible Nows of any definite kind has a very special structure. You can think of it as a landscape or country. Each point in the country is a Now.

There are things that I would say that you could call an instant of time or better, a now. As we live we seem to move through a succession of instants of time, nows, and the question is, what are they? There are where everything in the universe is at this moment, now.