THE PRESENT
Show me any room, anywhere, with two, ten, or a hundred people in it, and I will show you two, ten, or a hundred different views of reality.
We all have different histories or backgrounds. We are all trained differently. Even those trained in the same field have different understandings of that field. We all carry different beliefs, and we are all in our own way prejudiced. In short, we all perceive things differently.
On the surface, we believe that everyone is pretty much in agreement with what reality means. Grass is green, the Earth revolves, gravity operates, fire burns, etc. This belief is born of what we share with one another. However, because our connection to reality is based on our sensorial input, we aren't in as much agreement as we would like to believe.
The way we process information dictates how we believe reality to be at any given moment. This is further modified by our perception of that great chameleon, the past, and how we personally relate to it. In fact, I believe that since our sensorial input requires processing, we never really exist in the present at all, but probably reside a shade away from the now. We actually are living within what could be called the most permanent expression of past that we can contemplate—that which is closest to our last moment of experience.
To demonstrate how this might work, we have only to look at our sense of sight. Even though we can smell, hear, touch, or taste something, most people (except the visually handicapped) will initially doubt the input from these senses if they can't see something. We seem to put a lot more confidence in our vision to tell us what is real or not real.