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.
The Olmecs are believed to have spoken a language related to the Mixe-Zoquean languages, which are indigenous Mesoamerican languages still spoken today in southern Mexico. However, there is no direct evidence of the Olmec language, so much of this is inferred from studies of the culture and linguistic analysis of related contemporary languages.