Mayan languages system developed by the Academia de Lenguas Mayas de Guatemala (ALMG). Orthographies for the languages of Mexico are currently being developed by the Instituto Nacional de Lenguas Indígenas (INALI). The pre-Columbian Maya civilization developed and used an intricate and fully functional writing system, which is the only Mesoamerican script that can be said to be almost fully deciphered. Earlier-established civilizations to the west and north of the Maya homelands that also had scripts recorded in surviving inscriptions include the Zapotec, Olmec, and the Zoque-speaking peoples of the southern Veracruz and western Chiapas area—but their scripts are as yet largely undeciphered.
Olmec colossal heads were presumably widely available to the population. Together with these, of particular relevance to the colossal heads are the "Olmec-style masks" in stone, so called because none have yet been excavated in circumstances that allow the proper archaeological identification of an Olmec context. These evocative stone face masks present both similarities and differences to the colossal heads. Two thirds of Olmec monumental sculpture represents the human form, and the colossal heads fall within this major theme of Olmec art. The colossal heads cannot be precisely dated. However, the San Lorenzo heads were buried by 900 BC, indicating that their period