Motifs that can be found very frequently in the area of the site that has come to be known as New Chichen: the reclining effigy of a "Chac Mool" (a name invented by the French nineteenth-century explorer Augustus Le Plongeon) and the head of a (plumed?) serpent. Serpents are probably related to the feathered serpent cult, which is fairly well understood from the Central Mexican Postclassic period, while the function of the ubiquitous Chac Mools is more elusive.