I created a ridiculous ring with a screw fixed at the bottom to constrain the user to screw it into the handle of wooden seat. When sitting on the seat, the user must insert the finger into the ring so as to rest the arm properly on the handle; otherwise, the ring will make the arm to be rested very uncomfortably. Although the ring is still worn in almost the same manner, its nature has changed at that time with almost the similar aesthetic values. However, due to the aforesaid behavior, wearing the ring has become a prerequisite for the normal use of necessary product.