The Rainbow Factory is the central setting of the grim-dark My Little Pony fan-fiction of the same name, which in turn was inspired by an older song by Glaze, AKA WoodenToaster. Said song implied that the Cloudsdale "Rainbow Factory" is much darker than portrayed on the show, but left all details to the listener's imagination. The fanfic has grown to overshadow the song in popularity, so much that certain readers presume the song was inspired by the fanfic, instead of the contrary.