The wallpaper in the headmister's office has a flower design with tiny ears for the buds in the flowers. These tiny ears allow the headmister to hear anytning withen their office as long as they are in their office. The wallpaper can even let you hear chemicals in the brain forming to make thoughts. This gives off the illusion that the headmister can read minds in his office but it's actually him hearing so well he can hear the thoughts of others. Either way it has the same effect.