transition into three dimensional sculpture at Chichen Itza, perhaps spurred by the influence of central Mexican sculptural forms. A chacmool from Costa Rica was dated by the excavators to approximately AD 1000. Aztec Chacmool During the 1930 excavation of Templo Mayor, the only fully polychrome chacmool to be found at that site was in its original context on the top level of the Tlaloc side (the side dedicated to the rain god) of the temple. Because this chacmool statue sat in the same position as the sacrificial stone on the Huitzilopochtli side of the temple, "historical interpretations" are confirmed in the idea that this sculpture acted as a divine messenger, a link between the temple priest(s) and the god (in this case the rain god Tlaloc). The pigment that remained upon this chacmool sculpture was crucial for the iconographic identification of the figure, as it does not contain any iconography or symbols associated with the rain god Tlaloc (the god with which this sculpture is associated at the Templo Mayor). Upon this Aztec sculptures discovery, a color reconstruction was created as a result of the work involving a series of steps: the production of a line drawing of the statue, a diligent cleaning of the colored surfaces of the statue, and the establishment of spatial recognition by means of the use of "stereoscopic magnifying glasses and ultraviolet light." Scholars determined that the Aztec chacmool discovered at the Templo Mayor did in fact contain representations of the rain god (Tlaloc) by recognizing similarities between "the circular gold pectoral medallion, the color combination on the petticoat . . . the black skin, the red hands and feet, and the white headdress and bangles," all of which suggest similar stylistic and iconographic progression among earlier and later Mexica chacmool sculptures. A second chacmool discovery from the Templo Mayor and dating to a later period displays iconographic features which are distinct from the larger corpus of other figures but consistent with other sculptures found in the same context at the Templo Mayor. The other representations baring the distinct iconography include Tlaloc ritual vessels and bench reliefs. One of the distinct iconographic features is the representation of the eyes. Whereas Tlaloc's eyes are generally represented with a round goggle-like frame, the later chacmool, the vessels, and the bench relief feature a rectangular eye frame within which almond eyes are engraved. All three sculptures also include