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Time is relative; it is the difference of frequencies between two waves travelling at different angles to one another.
For time to exist, there must be events occurring in succession. For these events to occur, they must have a beginning and an end. There are two ways for this to happen: i) causality (events starting one after the other), or ii) simultaneity (all of them being simultaneous in nature). Events which occur due to causality can only happen as long as their cause precedes it; if the cause was absent before that event happened, then it did not really happen at all because its effect cannot be perceived without a preceding causal force.
The cause-and-effect paradigm is a form of sequential time, also called 'time as we know it' or in physics: Newtonian Time. However, events that occur simultaneously do not have a beginning or an end. Take for example two waves travelling towards each other on the surface of water; when they meet one another at their highest peak, there will be no force pushing them to either side and thus the event occurs with no causal relation between any other event occurring before or after.
This simultaneous event paradigm is also known as 'time as we don't know it' or in physics: Non-Newtonian Time. Since time, then, can only be perceived by events occurring within a causal framework, the question now becomes: what happens when you abandon causality? What do you have left?
The answer is that you are left with a world consisting of only one event: an infinite, eternal 'now' which cannot be perceived by any physical apparatus. This suggests that time as we know it may not really exist in the first place, since everything we perceive through our senses occurs within a causal framework and thus does not belong to the dimension of timelessness.
There is another way to escape time: the multiverse theory. According to this, our universe exists alongside many other universes which are entirely separate from one another and do not interact with each other at all. The worlds in these parallel universes have their own space-time dimensions where events occur independent of any causal framework whatsoever.
In this sense, human beings exist in several different dimensions simultaneously: one dimension where they are subject to Newtonian time and causality (the world we know), and simultaneous dimensions where events occur without the need for a causal framework. To perceive these alternate spaces-time means that our minds must somehow transcend the physical limitations imposed by their materiality.