これが有名な強制正座箱
http://t02.deviantart.net/KFDc1slqE76jzcXRvNQ_DJaa7H0=/fit-in/700x350/filters:fixed_height(100,100):origin()/pre01/f512/th/pre/f/2016/330/4/d/bathroombox_by_heveti-dapqpxd.jpg