long poem, "The First Hour of the Night" makes use of both the gates of ivory and horn to question certainty in fact and memory. The gates are also depicted as part of the Dream world in the graphic novel "The Sandman" by Neil Gaiman Music American progressive metal band Fates Warning's The Ivory Gate of Dreams, a 22-minute-long song on their album No Exit (1988). In 2015, Canadian melodic death metal/metalcore band The Agonist released the video for the song called "Gates of Horn and Ivory", as the first single from their upcoming record Eye of Providence. Software The neural-net library Keras, developed as part of project ONEIROS, is named in reference to the gate of horn (κέρας). References Fantasy tropes Metaphors Odyssey Aeneid Fictional gates