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((short description|Proposed hypothetical arcology))
((Verification|date=November 2022))
((Infobox building
| name             = X-Seed 4000
| native_name      = X-Sen Shushi 7000
| native_name_lang = Japanese
| status           = Proposed
| image            = X-seed4000.jpg
| caption          = The design of X-Seed 4000
| location         = [[Tokyo]], Japan
| coordinates      = 
| floor_count      = 700
| cost             = 900B to 1.7T
| highest_prev     = 
| building_type    = [[Mixed use]]
| roof             = ((convert|4,000|m|ft|0|abbr=on))
| developer        = [[Taisei Corporation]]
))
[[File:XSeed4000BurjDubaiComparison.jpg|thumb|Height comparison between the X-Seed 4000 and the [[Burj Khalifa]]]]
The '''X-Seed 4000''' was a [[concept]] for a [[skyscraper|megatall skyscraper]].<ref name="Accelerating Future">((Cite web |last=Anissimov |first=Michael |date=Feb 16, 2006 |title=Accelerating Future » X-Seed 4000 |url=http://www.acceleratingfuture.com/michael/blog/2006/02/x-seed-4000/ |url-status=dead |archive-url=https://web.archive.org/web/20080618150549/http://www.acceleratingfuture.com/michael/blog/2006/02/x-seed-4000/ |archive-date=Jun 18, 2008 |access-date=2022-11-25 |website=acceleratingfuture.com))</ref>  Its proposed ((convert|4|km|mi|adj=mid)) height, ((convert|6|km|mi|adj=mid|-wide)) sea-base, and 800-floor capacity could accommodate 500,000-1,000,000 inhabitants. This structure would have been composed of over 3,000,000 tons of [[steel]].

It was designed for [[Tokyo]], Japan, by the [[Taisei Corporation]] in 1995 as a futuristic environment combining ultra-modern and technological living and interaction with wildlife and nature.<ref>((Cite web |date= |title=Digital Studio - Contemporary Theories of Architecture Brief |url=http://digitalstudio.gre.ac.uk/content/view/125/31/ |url-status=dead |archive-url=https://web.archive.org/web/20060518173240/http://digitalstudio.gre.ac.uk:80/content/view/125/31/ |archive-date=2006-05-18 |access-date=2022-11-25 |website=digitalstudio.gre.ac.uk))</ref><ref>((Cite web |date=2004-05-04 |title=Taisei Construction Co. Ltd. |url=http://www.emporis.com/en/cd/cm/?id=100207 |url-status=deviated |archive-url=https://web.archive.org/web/20040504115106/http://www.emporis.com/en/cd/cm/?id=100207 |archive-date=2004-05-04 |access-date=2022-11-25 |website=emporis.com))</ref> Methods of transportation within the X-seed would most likely include [[MagLev|Maglev]] trains.

Georges Binder, managing director of Buildings & Data, a firm which compiles data banks on buildings worldwide, said the X-Seed 4000 "is never meant to be built . . . The purpose of the plan was to earn some recognition for the firm, and it worked."<ref name="Tall Tales">((Cite web |last=Lubell |first=Sam |date=September 12, 2007 |title=X-Seed Inspires Tall Tales ((!)) 2007-09-12 ((!)) Architectural Record |url=https://www.architecturalrecord.com/articles/3947-x-seed-inspires-tall-tales |access-date=2022-11-25 |website=www.architecturalrecord.com |language=en))</ref>

Unlike conventional skyscrapers, to remain habitable the X-Seed 4000 would have been forced to actively protect its occupants from considerable internal [[air pressure]] and external air pressure gradations and weather fluctuations that its massive elevation would cause. Its design called for the use of [[solar power]] to maintain internal environmental conditions.<ref name="Accelerating Future"/> As the proposed site for the structure is located in the [[Pacific Ring of Fire]], the most active volcano range in the world, the X-Seed 4000 would have been vulnerable to [[earthquake]]s and [[tsunami]]s.

A sea-based location and a [[Mount Fuji]] shape were some of this building's other major design features—Mount Fuji itself is ((convert|3776|m)) high, making it ((convert|224|m)) shorter than the X-Seed 4000.

The X-Seed 4000 was projected to be twice the height of the [[Shimizu Mega-City Pyramid]] at ((convert|2004|m)). 
The Shimizu Mega-City Pyramid (also planned for Tokyo, Japan) faces most of the same problems as the X-Seed. Other projects that, if built, could be in the top five human-made structures are the [[Ultima Tower]] of ((convert|3218|m)) in [[San Francisco]], Dubai City Tower of ((convert|2400|m)) and the [[Bionic Tower]] of ((convert|1228|m)) in either [[Hong Kong]] or [[Shanghai]].
== See also ==
* [[List of visionary tall buildings and structures]]
* [[List of tallest buildings and structures in the world]]
* [[List of tallest structures in Japan]]
* [[List of records of Japan]]

==References==
((reflist))

== External links ==
* [https://web.archive.org/web/20040517033219/http://www.emporis.com/en/wm/bu/?id=103142 Emporis.com Reference]

((Supertall proposed skyscrapers))

[[Category:Skyscrapers in Tokyo]]
[[Category:Unbuilt buildings and structures in Japan]]
[[Category:Megastructures]]
[[Category:Unbuilt skyscrapers]]
[[Category:Proposed arcologies]]


((Japan-struct-stub))

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