It's like a bath seat so that you feel the toilet, but just you can wash your hair, short and deep, even the people may be able to meet with his legs inside. Is it still considered a sitz bath, but deep a?

From what I've found, www.thethreehorseshoes.net / accom.php, if you scroll down to see the bathroom is part of the room Callowdown, appearance match its description, however, unusual seat is called bathroom. Can not find other references to be assembled into a description, however.