These bowls, each decorated with a roughly modeled human face, are manufactured by the modern Indians and used by them in burning copal gum in the ruins of the temples erected by their ancestors. Figure 70 shows a life-sized hollow head, in rough pottery, with a thin hollow neck, probably used to carry around in processions on the top of a long pole. There can be no doubt that these bowls and hourglass-shaped vessels, each decorated externally with a human figure or face, usually that of a god, were used as incense burners, since a number of them, as already stated, were found in a mound at Santa Rita with half burnt out incense still contained in them. Moreover, their use for this purpose persists to the present day among the Lacandones[50] and even among the Santa Cruz Indians. These incense burners occur most frequently in the central part of the Maya area and are not common in northern Yucatan or southern Guatemala. Three distinct types are found: The first include the large, well-modeled specimens found in and around burial mounds, decorated with the complete figure of the god (usually Cuculcan or Itzamna), having every detail in clothing and ornament carefully executed in high relief. These are all probably pre-Columbian, and such as have been found seem to have been used only as ceremonial mortuary incense burners, to be broken into fragments (which were scattered through or over the burial mound) immediately after use. The specimen shown in plate 20 and figure 67 is a typical example of this class. Incense burners of the second type are smaller, cruder, and probably later in date than those of the first type. Some of these are decorated with the entire figure, but more of them with the face only of the god.