The Rongorongo script is perhaps Easter Island’s greatest enigma. No-one is sure about how or when it was invented, and only about two dozen texts are known to exist in the world, none of which remain on the island. Most take the form of small wooden tablets, whose intricate glyphs were carved using shark teeth or shards of obsidian. The symbols themselves tend to represent the various flora and fauna of the island, including migratory birds, fish and anthropomorphic figures. Experts believe the texts likely had some sort of sacred purpose, though the meaning itself remains shrouded in mystery.When it comes to Rongorongo, there are far more questions than answers, but the island’s oral history tells of schools that were created to train young boys to write and interpret the texts. Scribes employed an unusual writing system called reverse boustrophedon, which required the reader to begin at the bottom left-hand corner and flip the tablet upside down at the end of each line.