It has also been suggested that chacmools were used as a "techcatl", or sacrificial stone over which victims were stretched so their hearts could be cut from their chests. The "Crónica Mexicayotl" describes such a sacrificial stone as sculpted in the form of a person with a twisted head. "Techcatl" were not just used for human sacrifice, they were also used in the "yacaxapotlaliztli" ceremony, where the nose of a future ruler was pierced. Such rituals may also have been executed upon chacmools, and the presence of small nose jewels sculpted onto various chacmools at Chichen Itza and one at Tula has been used to support this idea.