Not only a reminder to others who pass by...
@ILoveAmericaNews
... but to himself. "Never forget."
Decades ago, I sold big computer systems and, at one point, got too self-congratulatory for my own good. Things were going so well and I WAS SUCH A GENIUS I could tell from a short incoming phone call that "this was not a buyer", and turned it over to a new sales rep.
Turned out to be a slam dunk, and a nice one.
I got a copy of that contract and framed it. Hung right above my desk for years.