Odium is an audio museum in Seoul that displays Edison phonographs from the 19th century and rare audio systems from the 1920s to the 1960s. The building was designed by Kuma Kengo, and visitors can see and hear the historic sound equipment in person. Online advance reservations are required for one ticket per person on the website, and visitors move with a guide, with listening time in between. Photography is allowed but video is not, and reservations are difficult to secure, so free viewing is not possible.