When the ants first developed written language it was natural that they would use pheromones. But, recording scents on paper presents many challenges. Some pheromones are volatile and may dominate an entire page— others decay or change meaning over time. So the ants developed textured patches, little squares each designed to best absorb and preserve a particular pheromone— what was even better was that the specificity of these many textures made it possible to revive old volumes.
By grouping patches in sets of 6 more complex ideas could be conveyed. By skipping application of pheromones altogether, relying only on texture to convey meaning, books become less ceremonial & more information-dense. This is the origin of what humans call “ant braille” though, you must imagine, rather than binary raised or lowered dots a labyrinth of little squares representing 80 core textures & 200+ lesser-used variants whose meaning changes based on proximity & amplitude.