If someone had told Paleolithic humans that one day we would send messages with yellow faces, the reaction would surely have been one of bewilderment. However, the mechanism itself wouldn't have seemed entirely foreign to them. The paintings of Altamira or Lascaux, with their animals and hunting scenes, weren't texts, but rather a form of visual communication shared within the group. This is, according to some, the oldest antecedent of writing: not because there was a written language, but because there were signs with intentionality. This visual communication became more complex with the first cities of Mesopotamia. Clay tablets were used to record sacks of grain, animals, wages, or taxes. Initially, pictograms were used—that is, signs that represented objects. However, the administration of a state required distinguishing nuances (actions, quantities, functions), and pictograms were transformed into ideograms. The need to go further finally led to the appearance of phonograms, which represented sounds and were an essential step toward being able to write real languages.