Under the stars, among the sounds of the Gayasan forest

SEONGJU, North Gyeongsang Province — Every window in the classroom is open. A group of visitors lies on yoga mats with their eyes closed as a cricket starts up outside, then a bird, then the steady drone of cicadas. A singing bowl rings once, and the room goes quiet. The exercise is the final stage of "Forest Sound Demon Hunters," a soundscape program set to run this fall at Gayasan National Park Nature Center. The center is one of 10 nature centers the Korea National Park Service runs nationwid