The Battle of the Labyrinth camp for the school year. On his fifteenth birthday at the summer's end, Percy receives a visit from his father Poseidon, who gives him a sand dollar, admonishing him to “spend it wisely”. Nico later appears to tell Percy his plan to defeat Luke once and for all. "The Battle of the Labyrinth" was initially referred to as "Percy 4" until the title was officially revealed. The novel was teased by Rick Riordan behind the pages of its predecessor, "The Titan's Curse". It was based on the Greek myth of the labyrinth, where the Minotaur was supposedly kept. In his
Reims Cathedral were an allusion to the emerging status of the architect (through their association with the mythical artificer Daedalus, who built the Labyrinth of King Minos). The cathedral also contains further evidence of the rising status of the architect in the tomb of Hugues Libergier (d. 1268, architect of the now-destroyed Reims church of St-Nicaise). Not only is he given the honor of an engraved slab; he is shown holding a miniature model of his church (an honor formerly reserved for noble donors) and wearing the academic garb befitting an intellectual. The towers, 81 m tall (approx. 267 ft), were originally