Pocket universe

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Pocket universes are a type of very small parallel universe sometimes found in science fiction and fantasy. They are sometimes "attached" to a larger parent universe, making them literally pockets of space, but this is not a necessary feature and the name generally just refers to their small size. Small size can be a relative and subjective thing, however; some pocket universes are large enough to contain entire solar systems.

Notable pocket universes include:

• The Room of Requirement at Hogwarts School of Witchcraft and Wizardry in the Harry Potter series
• Bags of holding from Dungeons and Dragons (another type of literal "pocket" universe)
• Demiplanes in the D&D cosmology
• The interior of a TARDIS, from Doctor Who
• The Tesseracted Volume of Dr. Reed Richards, of the Fantastic Four
• The Land of the Lost
• Hammerspace, a humorous concept used by fans to explain where cartoon characters are able to pull items from "out of nowhere."
• "Monopol City" SF novel pocket universe, femtoverse, intereality
• The marbles from Men in Black.
• The Pocket Universe in post-Crisis Superman comics, designed by the Time Trapper as somewhere Superboy could come from.
• Parasite universes attached to the Discworld universe
• The band Pocket Universe from Edmonton, Alberta Canada, whose music is described as emitting from a Pocket in the Universe
• The place that the extra mass comes from/goes that Transformers gain/lose when they transform
• The sling bag used by Nakor, a character in the post-Riftwar and Serpentwar novels by Raymond E. Feist. A plot device where the character is able to bring out or hide all sorts of items in time to save the day. Strictly speaking the bag is not a pocket universe but rather has "seams in the stuff" or mini-rifts, where he can access items he has secreted away conveniently.
• Likewise, the backpack that Dora carries in the children's cartoon Dora the Explorer. Needed items of almost any size can be accessed simply by asking the viewer to say "backpack."
• The Flat-Space dimensional compression technology in Kurt Wimmer's UltraViolet.
• The night club Pocket D, found in City of Heroes and City of Villains.
• The Dunwich Room from the movie Cast a Deadly Spell.
• In the 853rd century DC Universe, as seen in DC One Million, every city in the Solar System is built into its own pocket universe, leaving the planetary surfaces almost untouched.
• Grandfather's pocket universe in the role-playing game Traveller.
• The Other Zone in LEXX, an "unstable partial universe" that consists of a shifting metaphorical landscape.
• Photon Nanotrance technology found in Phantasy Star Universe
• Omnyou Mystics from the anime series Magical Shopping Arcade Abenobashi main responsibility was to create an alternative universe for people when something tragic had happened to them. Though not directly explained as a Pocket Universe, it is presumed that the universe is limited to the imagination and knowledge of the Omnyou Mystic who created it.
• Mary Poppins bag she carries around appears to be one as it obviously holds a greater amount of mass then what the interior should be able to withstand.
• Link Books and bubbles from the Myst franchise. The Di'ni used books to for many things, refuge, prison, industry, ex.