Doors. They open and close, and are positioned at places of boundaries: between inside and outside, in the hallway and in the classroom. Some of them have locks, and are designed to protect the people inside from the people outside. When dogs are scared, sometimes they scratch at doors, begging to be let in the room with their masters. Some doors slide, others are cylinders divided into 4 compartments which revolve around, letting people through in a sort of haphazard manner. Elevators have doors, prisons have doors, and this MiniAlbum is made up of sounds related to doors.