Originally posted by Rob:
Time is an illusion. You've been told this but I will explain it. your brain works in points of conscience, like a frame-rate for a movie. (this is determined by the speed at which your brain processes input) The brain is also aware of these points of conscious and can compare it to the input. this is why we have a sence of time.
A common question relevant to time is; "why doesn't time just suddenly go the other way and make everything that happens unhappen (and visa-versa.) The answer is, every particle is following a set of rules and everything is a product of these rules. your brain witnesses this as input and creates a sense of time. In truth, time doesn't exist, only particles following rules do.
(The stuff about conscience points is not scientifically proven but is a very well thought out theory of mine.)
Time is inextricably linked with the increase of entropy. We are macro-scopic (the realm where this increase of entropy becomes apparent).
Therefore time is not an illusion, and it certainly does exist objectively - there is a definable physical quantity that increases with the forward direction of time, and would decrease if time was somehow reversed.
