I’ve always wondered.

This guy always freaked me out. He’s in the parking garage at 1800 Maple Avenue in Evanston, IL. Go there and see him. At every elevator there’s a sign. A sign with an icon for a man and an icon for a woman. And an icon of a gray man. Is he an alien? Is it some sort of pre-integration/racist statement? Does it mean that androids can ride the elevator, too? WHY?