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|This article does not cite any references or sources. (August 2007)|
Hammerspace (also known as malletspace) is a fan-envisioned extradimensional, instantly accessible storage area in fiction, which is used to explain how animated, comic and game characters can produce objects out of thin air.
The phenomenon which later became known as "Hammerspace" has been occurring in animation for many years. Inexplicable production of items dates back to the very beginning of animated shorts and was a fairly common occurrence during the golden age of animation. Warner Bros. cartoon characters are particularly well-known for often pulling all sorts of things — guns, disguises, bombs, anvils, mallets— from behind their backs or just offscreen. However, this phenomenon was mostly just left to suspension of disbelief. Only recently have fans created a pseudo-explanation to explain (albeit jokingly) the phenomenon.
The term "Hammerspace" itself originates from a gag common in certain anime and manga. A typical example would be when a male character would anger or otherwise offend a female character, who would proceed to produce, out of thin air, an oversized wooden rice mallet (saizuchi) and hit him on the head with it in an exaggerated manner. The strike would be purely for comic effect, and would not have any long-lasting effects. The term was largely popularized first by fans of Urusei Yatsura, and later of Ranma ½. It is believed by some that the term "Hammerspace" itself was coined after Ranma ½'s character Akane Tendo due to her frequency to produce large hammers from nowhere.
Another series that may have lead to the term is City Hunter. One of the lead characters in City Hunter—Kaori—makes extensive use of the "transdimensional hammers" as they are sometimes called, as they are one of the two main running gags in the series; the other is the extreme lecherousness of the other main character—Ryo—which almost invariably leads to the use of said hammers. The City Hunter hammers also require more explaining in terms of storage, as they are often considerably larger than the characters themselves, and thus more likely to inspire questions like "where did she get that from!?". At the very least, City Hunter predates Ranma by two years, and already had an extensive fanbase.
Another series that made extensive use of hammerspace was Kodomo no Omocha, where the mother of the main character would pull toy hammers of varying sizes to tap her daughter on the head to forge breaks in her ranting and offer a chance to glean understanding and wisdom.
Hammerspace in games 
The theory of Hammerspace can also be applied to many video games, as game mechanics often defy those of the real world: for instance, a character might be able to carry a sword larger than himself without any sign of it before use, and inventory capabilities are commonly implausible. This is particularly visible in traditional adventure games and RPGs. Early first person shooters tend to have the player character carry an entire arsenal of weapons (with full ammunition) without any visible drawback such as loss of pace or fatigue.
Many humorous adventures make gags on space in items inventory. In Space Quest series (III and VI), its protagonist Roger Wilco crams a full-sized ladder into his pocket. In Simon The Sorceror, Simon similarly obtains a ladder at one point, which he stores in his hat. In The Secret of Monkey Island, as a recurring gag, Guybrush Threepwood usually barely fits an oversized item in his clothes, from a 6 foot long q-tip to a huge idol's head statue, or even a monkey (which is shown moving underneath his coat).
Although there are numerous examples from the genre Hammerspace usage is not just limited to adventure games. In The Sims 2 the sims make extensive use of Hammerspace, regularly pulling items out of their back pockets which could not possibly fit there. Examples include rakes, hairdryers, watering cans and bags of flour. In addition they have seemingly limitless personal inventories in which they can carry round almost anything, from a mobile phone to a sports car without actually having anywhere to store it. These items are also occasionally pulled from the back pocket when used in game (as in the case of mobile phones). Although The Sims 2 is supposed to mimic reality in many ways it does still retain cartoon like elements and hammerspace was probably implemented to prevent sims having to trek to a storage shed/closet/drawer etc every time they wanted to use a certain item, something which would no doubt have been both boring for the player and impractical in terms of gameplay.
Television commercials over the years have used hammerspace:
- A Kit-Kat ad campaign from the late 80s involved a man and a woman in two separate commercials deciding they wanted something to eat. The woman pulls food items out of her purse, while the man pulls them out of his pants pocket, and the items they pull out before pulling out a Kit-Kat bar were items that, in real life, couldn't easily be stored there (i.e. the woman pulls a fully intact birthday cake out of her purse, while the man pulls a large hamburger out of his pocket).
- The term Hammerspace is often used synonymously with magic satchel; however, Hammerspace is an actual extra dimension where items are stored, whereas a magic satchel uses magic to either contain these items or to access Hammerspace itself. A similar to the way The Doctor (from Doctor Who) uses sufficiently advanced technology in his space-time machine the TARDIS to achieve the same results.
- More often than not, non-animated occurrences in film or television are explained as a plot hole rather than Hammerspace access, and dismissed due to suspension of disbelief. Examples include the live-action Highlander TV series, where the sword-wielding Immortals often have their weapons readily available despite their lack of a suitable container or article of clothing in which to carry a concealed sword.
See also 
- Universal comedy anime rules. Retrieved on October 22, 2006.
- Hidden Objects: The Hammerspace Phenomenon. Retrieved on October 23, 2006.
- Cartoon Physics 101: What is Hammerspace?
- MovieBob: Intermission
- What is Hammerspace?
- Comic books – how the industry works ("Hammerspace, where an object appears from nowhere for effect.")
- Roundup: High Tech, Eco Friendly Backpacks
- Ghost Rider: Spirit of Vengeance Review
- Hammerspace at obdwiki
- Matt Rundle's Anti-Hammerspace Item Tracker
- Hammerspace at paliaxcomic
- Laws of anime
- Thinking About Nektara