We are permanently in our own blind spot
It is hard to see what is going on if you are standing inside the fire. I guess that goes mostly for relationships. I see thinks with myself and my ex better now that we are apart. Hindsight does not correct anything, however.
Here is a new one for me. I bought and used some laminating film for cards or pics you might carry in your wallet. That was in 2014 and I saved what I did not use. Recently having a need to use it again I discovered that the first time I used it wrong. How did that happen? You learn something every day.