The Center of the Universe in Tulsa is a concrete circle a little more than eight feet in diameter that is an acoustic anomaly. Any noise made inside the brick circle is loudly echoed, but only those inside the circle can hear it. Amazingly, any of these loud sounds heard inside the circle cannot be heard from outside the perimeter of the brick structure. The Center of the Universe can be accessed in downtown Tulsa from a brick path that leads visitors from the Boston Avenue pedestrian overpass.