Leo stopped. He turned in a circle. The river sound was omnidirectional. It wasn't an object. It was a void. A massive, hollow space beneath his feet.
Leo dropped the phone.
He knelt down and swept the phone over the grass. The app, which had always been stable, stuttered. A new layer of sound emerged: a low, rhythmic clank . Then a whisper. Then the screech of metal on concrete. sonic maps android