Beauty nest is the popular waist nest now. The "lumbar fossa" are two concave fossa on the back and waist, which are located above the hip sacrum and on both sides of the lumbar joint. Known as "Maxwell" in medicine and commonly known as "waist nest" and "holy vortex" in the art world, it is one of the symbols of an ideal mannequin. There is also a name called "Venus' dimple" in the lumbar fossa, which is regarded as the sexy eye of the human body.