Everything changes

There's one thing for sure: Everything changes and everything is fluid and everything flows. 

Even when you take one sip of your water and then the second sip, everything changes. The water is not the same any longer, for starters: it has changed as soon as you have taken your first sip of it. Even the first and the second sips are not the same: they taste different somehow. You don't take the same pleasure that you have taken from the first sip as you do from the second one. What's more, the glass even doesn't look the same, it is emptier (or fuller - well you know the story and quote quite well, so I refuse to go into details). And you are not the same person as you were a few seconds ago. You were thirsty, now you are not. When all these changes are happening what do you do, feel and think? Probably something else, something more urgent, more crucial.