[image cred. HP Image Editor and rocket from my toybox]
One wouldn't ordinarily anticipate difficulty studying something that is everywhere all the time, but NOW is always in the process of disappearing, so we are confronted with a singular paucity of material. This essay must make do with pivotal moments in a fictional epic --which fortunately I have not thought up beyond the following three sentences:
1. NOW is suggested in opening lines: Deirdre inhaled air charged with salt and sunshine, felt the sea wind in her hair and realized, somewhat sadly, that she would never be this happy again.
2. And in meanwhiles: Meanwhile, Colonel Arsepaddler closed the portfolio and said, "You understand, don't you Frebbish, that if the missing diagrams are not in this folder by Swithin's Day there'll be ructions, I tell you, ructions!"
3. And continuations: Deirdre and Frebbish exchanged solicitous glances while the colonel gazed out the space-ship porthole as though something about the universe rather disgusted him.
Examples above describe moments of NOW as interstices wedged in an astragal of things that have happened and things that will happen because of them. We understand this because we were told stories --which all exploit this temporal enigma of sequence-- then went to school and learned to read them for ourselves.
School itself is simple enough but its systems of tuition and funding are too complicated to be understood except by a handful of eccentric mathematicians and most pirates. Both are pictured above in an illustration of a school board meeting in 2015.
I should also mention the universe. The universe is not stable. In fact it is higgledy-piggledy. Were it merely higgledy or piggledy there would be little point in mentioning it but it is both, so I should. In physics, mind and matter are simply two ways of organizing events. The universe is made of events. In it, all possible events are assembled. Interaction between what has happened and what might possibly happen will, for our purposes, adequately define NOW. You may also recognize it as a definition of LIFE, but that is another discussion.