This t-shirt, the all-IBM I-shaped brutalist building I worked at, and the customer demo mainframe idly blinking in the lobby all evoked the mighty past of a company bled dry by its senior management. Even the company store selling branded knick-knacks, it somehow made me very proud to work at such a centenary company.
The company I left IBM for? Yeah, it's just another Fortune 10 soul-less corporation in a nondescript glass building. Not that IBM wasn't, but at least you could see the computing history on the walls.