A Brief Moment in Time

I muse about time now and then (I almost wrote "from time to time"). What is it? Does it even exist? Do we move through it or is it like a current in which we are swept along?

Some say, and I agree, that we live in a 4 dimensional universe. The 1st dimension being time. Because, without time, can anything exist?

I also muse that things do not happen as we perceive them. They happen because we recall them. What we call the present doesn't actually exist. It is the future and then it is the past. There is no now.

There is a puzzle, an enigma, which is expressed as a question:

Where is the man when he jumps from the window?

If you answer "on the ledge" then you are wrong because that is before he jumped.
If you answer "in the air" then you are wrong because that is after he jumped.

An event happens outside of time. We know it happened or that it is about to happen but that is all. The now, the present, must exist between these two but it cannot be observed. In the time it takes to record it in our brains, it has become the past. If it cannot be observed, does it exist?

Or is it that only the present exists and that past and future are illusions? Mere memories and suppositions.