What a dope (reply not required).
I just remembered that in MacPilot, I had recently enabled a new feature: "Show path to current desktop picture on desktop".
It may take some creative thinking, but I'm (still) trying how to blame my wife for this lunacy…
27" i7 iMac (10.13.6), iPhone Xs Max (12.1)
Those who can make you believe absurdities can make you commit atrocities. ~Voltaire