Unconstrained by higher level physics and math training(ahem!), I like to imagine the dimension of time is spatial, and that although our bodies experience the time dimension only as 'now', one point on the timeline, time actually exists physically in its entirety. In other words, that the past exists, and the future exists, just as the beginning and end of a movie reel exist even when we're watching the middle of the film. They don't disappear. It's our body experience that is limited, not the dimension itself.