You open up a box and it's a 5000 piece puzzle.
"Cool", you think as you look quizzically at the mass of printed cardboard in front of you.
"How can I figure this out... Ah yes! Start with the edges. Let's build the base and build up from there."
You spend your time building this puzzle, carefully calculating each placement.
Sometimes you are wrong and it doesn't fit- sometimes you sit there in agony trying to figure out your next move. But in the end, you know this work will be worth it.
But along the way, your pieces get scattered and you lose one. No, not lost, but destroyed. Broken. Irreplaceable.
You hold onto it thinking "this *****" but continue to build on. This piece wont matter much now.
I can deal with it later.
Time passes and your hand continues to hover past that broken piece that will never find it's place right in your puzzle.
You still stumble here and there after more time passes, and you forget about that neglected piece.
You are down to the last and final piece. You are done!! but wait... where is that broken piece?
WHAT DID YOU DO WITH IT?
You frantically look for it and wonder why you didn't take care of it when it first broke. "Why am I feeling this horror now? After all, the break happened so long ago, and I didn't even notice that it was gone.
Why is that hole in my beautiful masterpiece growing bigger?
Why is that hole ******* up the beauty around it and disrupting my peace?
What, where?!
Piece?..
No. That piece is gone."

That peace is gone.