A spanish horse and a wooden pony are different. The severity is the difference. The severity is determined by the construction and the length of time the sub is on it. The principle is the same. A wooded pony is not as severe. A spanish house was originally used as pure torture, man or woman. Spain came up with it 5 or 6 hundred years ago. Its a inverted V made of wood boards. The top, or point is very fine. Its purpose is to HURT. The concept really flouts MY boat. Put your sub on a wooden pony, give her her instructions while she's riding it and you are flooging her to make sure she is GEETING IT, and enjoy her wanting to privide for you. I have a GREAT design for one in my head. I can't draw a strieght line so I couldn't put it on paper. But it would be fun. Remember, the key is severity and or lenght of time. Be smart.