Manacles on the wall. Tiny rocks are under the floor for weight and stability. Princess Wisteria is too nice to have an actual torture chamber, but she is not above tying people up and tickling them. :)
The door flips down over the moat, is held up with a small black snap. I was going to put a felt needle holder there but because of the curve of the cup, it wouldn't be practical or functional so I just left it off completely.