About Memory
A memory is a current thought about a past experience or person.
And because our current thoughts can change in an instant, our memories are not static.
Sometimes you forget about a past experience which makes it impossible to have a memory (a current thought) about the "now non-existent" past experience.
This is a hallmark of Alzheimer's Disease.
Sometimes you think about overworking a piece and all the time, materials, and energy that were "wasted" creating an ultimately "unsatisfying outcome." The subtext possibly being: Everything was a big disaster and not the way things were supposed to turn out at all.
This is your memory about a particular piece.
And if and when your perspective changes, you might remember the exact same "frustrating, disheartening, and aggravating" experience as all of the above plus:
That was a key turning point for me artistically.
Subtext: The whole experience was perfect. That was exactly the way things were supposed to turn out.
These are your new memories about that particular piece.
These are your current, up-to-date memories about that past experience of creating that piece.
Just give it a little time.
You never know how many new memories you will have about the same darned experienced.