''World of Tiers'' is a series of ScienceFiction novels by Creator/PhilipJoseFarmer.
!!This series provides examples of:
* AIIsACrapshoot: Black Bellers.
* AncientArtifact: The Horn of Shambarimen.
* AmnesiacGod: As revealed at the end of the first book, [[spoiler:Robert Wolff is Lord Jadawin, but lost his memories after being defeated by another lord and being stranded on Earth.]]
* AuthorAvatar: Paul Janus Finnegan (note the initials).
* CoolGate: Inter-dimensional machines/gates.
* DimensionalTraveler: Paul Janus Finnegan (AKA Kikaha the Trickster) and Robert Wolff spend much of the novels traveling through artificially created universes.
* EvilRedhead: Red Orc.
* GrandTheftMe: Black Bellers are capable of taking over the bodies of human hosts.
* ImColdSoCold: Last words of a Drachelander (German-descended) knight in the first book, after he was swarmed by enemies and the protagonist arrived just too late to save him: "'''siz kalt''."
* InterdimensionalTravelDevice: People can travel between the artificial universes of the setting by using gates. Gates can be activated by various means, including tokens and playing music on a special horn.
* HealingFactor: All Thoans and some dwellers of the pocket universes able to regenerate lost and damaged body parts.
* PortalCut: One of the many interdimensional teleport gates is a trap that dismembers by severing the connection and the intruder.
* RecursivePrecursors: [[spoiler:This fact has been revealed in ''Behind the Walls of Terra''. Thoan home universe itself has been created by unknown race.]]
* RedPillBluePill: An aging man with a failed life and a shrewish wife is in the basement of a tract house he is buying when a door between the worlds opens up. He can stay with his living-death retirement or leap into the utter unknown. Soul-killing safety vs death-or-glory.
* SignificantMonogram: Paul Janus Finnegan's initials are the same as Phillip José Farmer's. This is something of a recurring easter egg in Farmer's works.
* VillainousIncest: Incest is perfectly acceptable among the Lords and Ladies of the pocket.
* WhatHappenedToTheMouse: The eventual fate of [[spoiler:Robert Wolff/Lord Jadawin and Chryseis]] is never revealed after their disappearance in ''A Private Cosmos''.
* WorldShapes: The World of Tiers takes the form of a world-sized Tower of Babel, just that the continent-sized layers (tiers) are way wider than they are tall. And the top layer has the Lord's palace on it.
* YearInsideHourOutside: Time in the pocket universes moves quite differently indeed.