Center of the Universe is a favorite stop for scavenger hunts, Tulsa visitors, skaters, rebels, and people who like to hear the sound of their own voice. If you stand in the right place in the sound bubble your voice will echo back to you, though others won't hear it.  It's a great place to visit for free fun. It can be a romantic (and cheap) stop for date night or an interesting place to take out of town guests.