How the past, present, & future can be perceived.

The word "now" sounds like just a simple, three letter word. Sometimes, however, "now" be perceived as an infinitesimally small slice of time between the future and the past. There is no single answer to how long the present time is. If we were to think more and more about "now", then we would realize that our perception of the present time might be getting ever shorter. And if this is the case, then it now seems that as result, the past and the future would now seem to be longer than may have thought before. In other words, the more we divide time up, the shorter the now gets. In fact no one knows yet what is, and if there is, a fundamental building block of time, unlike matter, which we know is made up of atoms. When I think about what "now" really is, I think that it is made up of this smallest unit of time, although again, there is no single answer to what is considered to be in the now. And after I have pondered this mystery quite a lot, I realize that the future and past are "collapsing in on themselves" in a sense, into that infinitesimally small time frame . So, I start thinking to myself, if this is so, then is there even such thing as the present? Maybe it's just a blend of the past and the present. We probably like to think "now" quite a lot. Yet, does this word mean a single moment in time? If you say "now" one minute, and another minute later, you say it again while referring to the first time you've said it, are you still describing the same moment? Or, perhaps, what could really be happening is that the moment we might all think of as "now" is ever present. It is generally considered that the past and future are all the same. In other words, this means that both exist at the same time.