Dad goes around the house placing check marks on every piece of mail addressed to him. He does this with a growing collection of pens he bounds with rubber bands. He hordes pens and other items he deems important. Right now, he's investigating an old Thai restaurant menu and placing check marks next to key dishes.
His actions remind me of the power of the check mark. This act was probably learned by him early in his professional life as an electrical engineer turned stockbroker. How many retired executives have this hand motion ingrained in their psyche and continue to perform it long after it serves any usefulness but still functions as an act of self-hood?