Also known as: レディポット, ジグザグカンパニー
A fetish in which a person's body is placed inside of a Pot or Vase so that only their head and private parts are exposed.
On Pixiv some early illustrations are tagged "ジグザグカンパニー" (Zigzag Company) because it's the circle name of the inventor of the fetish, Kosei Ryuda (post #11882074).