The Olmecs, often considered the "mother culture" of Mesoamerica, are known for several significant accomplishments. They developed one of the earliest known complex societies in the region, creating large ceremonial centers like San Lorenzo and La Venta. The Olmecs are also credited with advancements in art, particularly their colossal stone heads and intricate jade carvings, which reflect their sophisticated craftsmanship. Additionally, they contributed to early forms of writing and the Mesoamerican calendar system, influencing later cultures such as the Maya and Aztecs.
The sculptures Pietà and David. The vast mural paintings in the Sistine Chapel of the Vatican, Rome.
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The Olmecs used glyphs to write their language, but because the language is unknown it is likely that the glyphs will never be translated. The term "hieroglyphs" implies that the writing is entirely religious in character, but since we do not know that, it is more accurate to call them "glyphs". The link below takes you to a site giving an analysis of Olmec glyphs.
Current thinking is that the language of the Omlec is related to the Zoquean branch of Mixe-Zoquean language family. There is a suggestion that Omlecs may have had at least two source languages, the Olmecs of San Lorenzo spoke proto-Mixe and the Olmecs of La Venta spoke proto-Zoque