[Whys]

Time is change, obviously, and motion is but one expression of change.

What is change? Change is the recollection or at least the sense that things are no longer what they were before.

It could be that time does not exist. Instead, our mind's perception of change may simply build upon itself in a rational manner as it gains in awareness. Awareness is illusive and may not require time, but instead creates it.

Just a thought I've always had... but only now became aware of. ;)