“What is it with all the chicken bones all over the place? We can’t take a walk without finding chicken bones,” says Steve Mulder, who owns Zoom Room in Rockville with his partner Jean-Louis Marechal.

To those who think the practice of reading tarot is an occult art reserved for spook sessions, let’s get this out of the way: It isn’t. Like therapy, meditation, and advice from friends, tarot is ...