Editing Perpendicularity

{{Magic
|image=Unity by Marie Seeberger.jpg
|related=[[Realmatic Theory]], [[Shard]]s, [[Investiture]]
|universe=[[Cosmere]]
|books=[[Elantris (book)|Elantris]], [[Mistborn (series)|Mistborn]], [[The Stormlight Archive]], [[Sixth of the Dusk]]
}}
{{update|sa4|mb7}}
{{quote
|At these points, Physical matter, Cognitive thought, and Spiritual essence become one--and a being can slide between Realms.
|From [[Khriss]]'s essay on the [[Drominad system]]{{au ref|drominad}}
}}
A '''perpendicularity''' is  a junction between the [[Physical Realm|Physical]], [[Cognitive Realm|Cognitive]], and [[Spiritual Realm]]s. They are used by [[worldhoppers]] such as [[Hoid]] to go from planet to planet. They are formed through the concentration of [[Investiture]]. Because of this, they are most commonly found at places where a Shard's power is focused, often in the form of a pool of liquid. A Shard can control where their perpendicularity manifests.{{wob ref|11322}} A perpendicularity may manifest as the Shards color.

== Creation ==
Perpendicularities occur naturally when a [[Shard]] spends lots of time on a world.{{wob ref|3504}} Generally, leaving a planet would cause the Shard's perpendicularity to disappear. As a result, their presence is often used to indicate the presence of a Shard. Special circumstances, however, can prevent the perpendicularity from disappearing, and there is at least one Shard that fits these circumstances.{{wob ref|2570}}{{wob ref|4740}} [[Autonomy]] is capable of creating perpendicularities unexpectedly across multiple planets in a way that goes against the laws of [[Realmatic Theory]] as it is currently understood by arcanists.{{book ref|mb7|50}} It requires specific conditions.{{book ref|mb7|59}} 

Some perpendicularities can be forcibly closed by having people utilize the massive amount of Investiture coming from it.{{book ref|mb7|64}} [[Nightblood]] is able to collapse a perpendicularity.{{wob ref|12915}}{{book ref|sa4|111}}

== Mechanics ==
Perpendicularities are formed at locations with a large concentration of Investiture. The concentration of Investiture brings the three realms closer together and allows travel between them.{{au ref|drominad}} Perpendicularities will not transport people between realms unless they want it to happen.{{book ref|mb7|64}} They can be used to see into the Spiritual Realm.{{wob ref|10945}} The proximity of the realms also makes [[Soulcasting]] easier.{{book ref|sa3|120}}

[[Aluminum]] can be used to take liquid from a perpendicularity, and it will stay Invested.{{wob ref|9233}} Some perpendicularities are more Invested than others.{{wob ref|5914}} The enormous concentration of Investiture in a perpendicularity makes it possible to become a Cognitive Shadow by entering one.{{wob ref|8324}} In at least some circumstances, a perpendicularity's liquid Investiture may be unkeyed.{{book ref|mb7|64}}

== Known Perpendicularities ==
; Scadrial
* '''Ruin''': the pool below the [[Pits of Hathsin]] was [[Ruin]]'s perpendicularity; it was the main path used by inter-world traders before it was destroyed by [[Kelsier]].{{msh ref|2|1}}
* '''Preservation''': [[Preservation]]'s perpendicularity was the [[Well of Ascension]]. It served as [[Ruin]]'s prison, making it extremely dangerous.{{msh ref|2|1}}
* '''Harmony''': [[Harmony]] has a perpendicularity somewhere in the south, it is known to be under careful watch by the Malwish.{{book ref|mb7|50}} An article in ''[[The House Record]]'' mentions a woman coming across a perfectly blue pool somewhere in the mountains in the Southern [[Roughs]], and a sudden appearance of a strange figure by the pool. It's possible, though not confirmed, that this could be Harmony's perpendicularity.{{file ref|House_Record_broadsheet.jpg|''The House Record'' Broadsheet}}
* '''Autonomy''': Autonomy briefly had a perpendicularity on in [[Bilming]], that was since destroyed by [[Marasi Colms]], [[Armal]], and several other Allomancers.{{book ref|mb7|50}}

; Sel
* '''Devotion''': [[Devotion's Perpendicularity|The Pool]] near [[Elantris (city)|Elantris]] is [[Devotion]]'s perpendicularity.
* '''Dominion''': There is a second perpendicularity on Sel,{{wob ref|13093}} presumably of [[Dominion]].

; Threnody
* Threnody does not have a stable perpendicularity, but rather a number of unstable, unpredictable ones of a morbid origin.{{au ref|threnodite}} They may possibly have something to do with the creation of [[Shade]]s, although the fact that the Shard of [[Ambition]] has died near the system has far greater influence on their creation.{{wob ref|12922}} It is more of a circumstance than a location.{{wob ref|14992}}

; First of the Sun
* First of the Sun is notable for having a perpendicularity, presumably [[Patji's Eye]], without a Shard in residence.{{au ref|drominad}} However, [[Patji (being)|Patji]] is an avatar of [[Autonomy]],{{wob ref|9385}} which is likely the cause of the perpendicularity.

; Roshar
* '''Cultivation''': [[Cultivation's Perpendicularity]] is located in the [[Horneater Peaks]], under the surface of one of the [[Horneater Oceans]]. For [[worldhopper]]s of Roshar, it's the main method of travelling between Roshar and its subastral, [[Shadesmar]].{{book ref|sa3|93}} Most recently, it has been besieged by the [[Fused]].{{book ref|sa3|102}}
* '''Honor''': [[Honor's Perpendicularity]] is well-known among worldhoppers and [[spren]] to be unstable and dangerous.{{book ref|sa3|93}} The exact pattern of its appearance is uncertain, although [[Dalinar]] manages to open it upon swearing the Third Ideal of the [[Bondsmiths]]. The perpendicularity closes on its own within a few minutes.{{book ref|sa3|119}}
* The [[Surge]] of [[Transportation]] temporarily creates a miniature perpendicularity, allowing an [[Elsecaller]] or [[Willshaper]] to travel into Shadesmar from anywhere.{{wob ref|1525}} However, returning back to the [[Physical Realm]] presents a far greater challenge, and can only be performed in some places.{{book ref|sa2|epilogue}} It is unclear if this allows travel to the Spiritual Realm.

;Nalthis
* '''Endowment''': The location of [[Endowment]]'s perpendicularity is unspecified. It is, however, located somewhere in the jungles of [[Hallandren]]. The [[Tears of Edgli]] owe their existence and their unusual properties as dye material to soaking up the [[Investiture]] flowing up from the perpendicularity.{{wob ref|9833}} There are enough cosmere-aware people on Nalthis for there to be customs at this perpendicularity,{{wob ref|9501}} and it is used for trade.{{book ref|mb7|39}}

;Yolen
* There is something similar to a perpendicularity on Yolen, despite the lack of a Shard.{{wob ref|14885}}

;General Cosmere
* '''Autonomy''': Autonomy has an ability to create and collapse perpendicularities in a way that goes against the understanding of Arcanists.{{book ref|mb7|50}}{{au ref|taldain}} These have specific constraints and conditions in order to be produced.{{book ref|mb7|59}} Despite the specific conditions, she is known to have created perpendicularities across multiple worlds across the cosmere.{{book ref|mb7|50}}

== Notes ==
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{{Cosmere}}
[[Category:Perpendicularities]]
[[es:Perpendicularidad]]