The one sculpture which identifies the Mexicas above all others is the Stone of the Sun, discovered in December, , in the Plaza Mayor of the capital of New Spain. Because of its symbolic content, with the names of the days and the cosmogonic suns, it was incorrectly identified as the Aztec Calendar. This is a large gladiatorial sacrificial altar, known as a temalacatl, which was not finished because of a deep crack that runs from one side to the center of the piece at the rear. Despite the fracture, it must have been used to stage the fights between warriors in the tlacaxipehualiztli ceremony.