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There are three conventional spatial [[dimension]]s: length (or depth), width, and height, often expressed as x, y and z. x and y axes appear on a plane Cartesian graph and z is found in functions such as a "z-buffer" in computer graphics, for processing "depth" in imagery. The '''fourth dimension''' is often identified with [[time]], and as such is used to explain [[space-time]] in Einstein's theories of [[special relativity]] and [[general relativity]]. When a reference is used to four-dimensional co-ordinates, it is likely that what is referred to is the three spatial dimensions plus a time-line. If four (or more) spatial dimensions are referred to, this should be stated at the outset, to avoid confusion with the more common notion that time is the Einsteinian fourth dimension.
There are three conventional spatial [[dimension]]s: length (or depth), width, and height, often expressed as x, y and z. x and y axes appear on a plane Cartesian graph and z is found in functions such as a "z-buffer" in computer graphics, for processing "depth" in imagery. The '''fourth dimension''' is often identified with [[time]], and as such is used to explain [[space-time]] in Einstein's theories of [[special relativity]] and [[general relativity]]. When a reference is used to four-dimensional co-ordinates, it is likely that what is referred to is the three spatial dimensions plus a time-line. If four (or more) spatial dimensions are referred to, this should be stated at the outset, to avoid confusion with the more common notion that time is the Einsteinian fourth dimension.
*[[Fourth Dimension (Stratovarius album)|Fourth Dimension]] is an album by [[Power Metal]] band [[Stratovarius]]
*[[Fourth Dimension (Stratovarius album)|Fourth Dimension]] is an album by [[Power Metal]] band [[Stratovarius]]
*The fourth dimension has been a subject of popular fascination since at least the 1920s. See ''Into the Fourth Dimension'' (1926) by [[Ray Cummings]], the comic [[Eugene the Jeep]] or [["—And He Built a Crooked House—"]]<!-- Quote marks are part of the title --> by [[Robert A. Heinlein]]
*The fourth dimension has been a subject of popular fascination since at least the 1920s. See ''Into the Fourth Dimension'' (1926) by [[Ray Cummings]], the comic [[Eugene the Jeep]] or [["—And He Built a Crooked House—"]] by [[Robert A. Heinlein]]
*''[[Donnie Darko]]'' uses the Fourth Dimension as a plot for [[Time Travel]]ing. The reference is related to water being a fourth dimensional tool for time traveling.
*''[[Donnie Darko]]'' uses the Fourth Dimension as a plot for [[Time Travel]]ing. The reference is related to water being a fourth dimensional tool for time traveling.
*[[Alan Moore]]'s [[graphic novel]] ''[[From Hell]]'' uses the fourth dimension as a reference to the insanity of [[Jack the Ripper]]'s character.
*[[Alan Moore]]'s [[graphic novel]] ''[[From Hell]]'' uses the fourth dimension as a reference to the insanity of [[Jack the Ripper]]'s character.
*In the videogame ''[[Mother (video game)|Mother]]'', the main character can use a special PK ability called "Fourth Dimension Slip" to instantly get out of any battle.
*In the videogame ''[[Mother (video game)|Mother]]'', the main character can use a special PK ability called "Fourth Dimension Slip" to instantly get out of any battle.
*In [[Frank Herbert]]'s ''[[Dune (novel)|Dune]]'' the fourth dimension is used when folding space to allow instantaneous travel through space.
*In [[Frank Herbert]]'s ''[[Dune (novel)|Dune]]'' the fourth dimension is used when folding space to allow instantaneous travel through space.
==External links==
==External links==
