The beauty in any piano piece mainly relies in 3 variables. It relies in having each note that plays to be slightly different from the one before it; not too similar, not too different (variance). It relies in having the piece shift between the fast and the slow pace to form the perceived harmony right in the middle (speed). It relies in having the pitch of these notes interchange between the happy and the sad (balance).
Without variance between people, life would be dull. We need people who are different from us just as much as we need people who are similar to us, and the best people for us are those in the middle; not too similar, not too different.
Without speed changes in life pace, life would be boring. We will have fast-paced days where we can barely catch up, and we will have days where we’re taking a step back, slowing down, reflecting and relaxing; both are necessary for each other.
Without balance between good and bad, life would be meaningless. We must have bad days to have good ones. If there was nothing wrong, then there’d be nothing right; both have to coexist.