If you think about now, then what do you think of? Isn't it weird how the 'now' you just lived in has made space for a new 'now' already? Now seems like the most normal thing - but it is actually one of the most abstract ideas we have in life. You can't simply live in the now, since it passed so quickly. It's right on the border of the past and the future, but still we can experience it for some reason.

If there were no now, there would be no border between the past and the future, there would be nothing. We would not be able to experience anything, not be able to do things. So even though now does not seem to exist, it does really exist at the exact same time.