The Altaïr memory sequences — Revelations' structural innovation, the playable glimpses of the series' original Assassin embedded within Ezio's mission, the two protagonists separated by three centuries whose paths converge in the same place. Altaïr walked the path Ezio is following in the most literal sense: he came to Masayas, he left the keys, he intended someone to follow. The brotherhood is both the organization and the bond between the two men who never met but are connected across time by the same purpose.