A fantasy world book is a type of imaginary world, part of a fictional or the imaginary universe used in fantasy novels and games. Typical worlds contain magic or magical abilities and repeatedly, but not for all time, either a medieval or futuristic theme. Few worlds may be a parallel world somewhat connected to Earth through magical portals or items; a fictional or the imaginary Earth set in the remote past or future; or wholly independent world set in another universe or earth. Numerous fantasy worlds draw greatly on real world history, geography and sociology, and as well on folklore.