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Image distortion caused by projection
The keystone effect is the apparent distortion of an image caused by projecting it onto an angled surface. It is the distortion of the image dimensions
Keystone_effect
Species with a large effect on its environment
A keystone species is a species that has a disproportionately large effect on its natural environment relative to its abundance. The concept was introduced
Keystone_species
Wedge-shaped stone at the apex of a masonry arch
the arch surrounding the keystone is called a crown. Keystones or their suggested form are sometimes placed for decorative effect in the centre of the flat
Keystone_(architecture)
Topics referred to by the same term
Look up keystone in Wiktionary, the free dictionary. Keystone or key-stone may refer to: Keystone (architecture), a central stone or other piece at the
Keystone
Convex quadrilateral with at least one pair of parallel sides
other, it appears to be an isosceles trapezoid, called the keystone effect because arch keystones are commonly trapezoidal. For example, when a rectangular
Trapezoid
Keynes effect (economics and finance) (Keynesian economics) Keystone effect (technology) Kinetic depth effect (perception) Kinetic isotope effect (chemical
List_of_effects
Taiwanese electronics brand
He criticised the image quality issues caused by the rainbow effect and the keystone effect as well as the large size of the projector that made it cumbersome
Optoma
Species of dam-building rodent
species is not always considered invasive, as in Europe it has a similar keystone effect to European beavers, which have not recolonized the area. The beaver
North_American_beaver
Private college in La Plume, Pennsylvania, US
Keystone College is a private college in northeastern Pennsylvania, United States. Although the college's official mailing address is La Plume, Pennsylvania
Keystone_College
Digital image distortion
together with their exact adjoints and derivatives. Anamorphosis Keystone effect, one of the defects often repaired by warping Radar geo-warping Softwarp
Image_warping
Reducing photographic perspective distortion
taste. See 3D projection for details. Anamorphosis Distortion (optics) Keystone effect Ray, Sidney F. (2002). "63.6: Rectification printing". Applied photographic
Perspective_control
Tax collection company in Pennsylvania
Keystone Collections Group, owned by Kratzenberg & Associates Inc., is a privately held local tax collections company operating primarily out of Irwin
Keystone_Collections_Group
Study of the experience and ritual use of light by ancient peoples
distortions seen in some deep cave art. This distortion is known as the keystone effect. Gatton proposed that the deep cave distortions may have resulted from
Archaeo-optics
correction is a specific case known as keystone distortion correction derived from Keystone effect. Keystone distortion gets its name from the symmetric
Image_geometry_correction
Aspect of ecosystems
a keystone species, a species that could directly affect the food chain and has a significant impact on the environment. The absence of a keystone species
Food_chain
A keystone is a small wooden or plastic fitting used in ale casks. For some years wooden casks have been effectively obsolete, with the majority now being
Keystone_(cask)
Species protected to aid further species
either a flagship species whose conservation benefits other species or a keystone species which may be targeted for conservation due to its impact on an
Umbrella_species
British oil and gas exploration company operating in Iraqi Kurdistan
Gulf Keystone Petroleum Limited is an independent oil and gas exploration and production company that operates in the Kurdistan region of Iraq. It is also
Gulf_Keystone_Petroleum
become invasive. When a keystone species, such as a top predator, is removed from a community or ecosystem, an ecological cascade effect can occur. When this
Ecological_release
Predator at the top of a food chain
recorded after the gray wolf, both an apex predator and a keystone species (one with a large effect on its ecosystem), was reintroduced to Yellowstone National
Apex_predator
Country in northwestern Europe
whose laws of motion and illumination of gravity have been seen as a keystone of modern science; from the 19th century Charles Darwin, whose theory of
United_Kingdom
President of the United States (2017–2021; since 2025)
withdrawal from the Trans-Pacific Partnership negotiations, advancement of the Keystone XL and Dakota Access Pipeline projects, and planning for a wall along the
Donald_Trump
English actor and filmmaker (1889–1977)
1914, Chaplin gained widespread popularity through his appearances in Keystone Studios films. He soon introduced and adopted the Tramp as his screen persona
Charlie_Chaplin
Ecology term
biomass. This keystone species effect forms the basis for the concept of ecological extinction. The potential role of the sea otter as the keystone predator
Ecological_extinction
Family of mammals
open the shellfish that form a significant part of its diet. It is a "keystone species", keeping its prey populations in balance so some do not outcompete
Mustelidae
Object of ongoing debate
NAFTA-related reasons like relocation of U.S. firms to Mexico. In Pennsylvania, Keystone Research Center attributed 38,325 in job losses in the state to trade with
NAFTA's effect on United States employment
NAFTA's_effect_on_United_States_employment
Hollywood. Alan Reed. Chester Conklin as Keystone Cop #1. James Gleason. Charles Halton. Hank Mann as Keystone Cop #2. 37 7 "Hollywood Trip" Sheldon Leonard
List of The Danny Thomas Show episodes
List_of_The_Danny_Thomas_Show_episodes
American politician (born 1954)
land from tar sands production. In February 2013, while protesting the Keystone XL Pipeline Kennedy, along with his son, Conor, was arrested for blocking
Robert_F._Kennedy_Jr.
1987 United States Supreme Court case
Keystone Bituminous Coal Ass'n v. DeBenedictis, 480 U.S. 470 (1987), is a United States Supreme Court case interpreting the Fifth Amendment's Takings Clause
Keystone Bituminous Coal Ass'n v. DeBenedictis
Keystone_Bituminous_Coal_Ass'n_v._DeBenedictis
Effects of radical activists for a cause
The radical flank effect refers to the positive or negative effects that radical activists for a cause have on more moderate activists for the same cause
Radical_flank_effect
Amtrak service between Pittsburgh and New York
uses the same Amtrak-owned Philadelphia to Harrisburg Main Line as the Keystone Service trains, but continues further west via the Pittsburgh Line through
Pennsylvanian_(train)
Character played by Charlie Chaplin
originally created by accident while Chaplin was working at Mack Sennett's Keystone Studios, when dressing up for the 1914 short film Mabel's Strange Predicament
The_Tramp
Study of organisms and their environment
term keystone species was coined by Robert Paine in 1969 and is a reference to the keystone architectural feature as the removal of a keystone species
Ecology
Political party in the United States
emissions from coal. In particular, many Republicans supported building the Keystone Pipeline; this position was supported by businesses, but opposed by indigenous
Republican Party (United States)
Republican_Party_(United_States)
Joe, and an ancestor of Eobard. In season one, Eddie transferred from Keystone City. He is initially jealous because of Barry's childhood bond with Iris
List_of_The_Flash_characters
Large animals
environmental decline. Keystone megafauna's larger mass and range is significant to such roles they play in their ecosystems. Distinguishing a keystone megafauna from
Megafauna
President of the United States from 2009 to 2017
July 2013, Obama expressed reservations and said he "would reject the Keystone XL pipeline if it increased carbon pollution [or] greenhouse emissions
Barack_Obama
American neo-Nazi cartoonist
username to the effect of maximizing the visibility of the disclosed information. Twitter's response created an instance of the Streisand effect, amplifying
StoneToss
2025 economic policy by Donald Trump
25% tariff on imported automobiles and automotive parts scheduled to take effect at midnight on April 3, 2025. These previous measures had already increased
Liberation_Day_tariffs
President of the United States from 2021 to 2025
in the United States, and revoking permits for the construction of the Keystone XL pipeline. On March 11, Biden signed into law the American Rescue Plan
Joe_Biden
Season of television series
contact with President Benjamin Hathaway and later decides to travel to "Keystone" to meet him along with Pope, Fisher, Bressler, and their Volm ally, Cochise
Falling_Skies_season_3
Approach to selling a product or service
be £200. In a competitive industry, it is often not recommended to use keystone pricing as a pricing strategy due to its relatively high profit margin
Pricing_strategy
2021–2025 U.S. presidential administration
U.S. participation in the Paris Agreement, revoking the permit for the Keystone XL pipeline and halting funding for the Mexico–United States border wall
Presidency_of_Joe_Biden
Species of fig native to the Americas
then pupate in the ground. Ficus citrifolia is considered a tropical keystone species. Figs are a major component of the diets of more species of animals
Ficus_citrifolia
Biological interaction
preventing a single species from becoming dominant. Such predators are known as keystone species and may have a profound influence on the balance of organisms in
Predation
Country in Central Europe
"Report warns of rising wealth inequality in Switzerland". SWI swissinfo.ch. Keystone-SDA. 24 September 2019. Archived from the original on 23 December 2021
Switzerland
Explanation for tree species biodiversity in rainforests
post-germination. The Janzen–Connell hypothesis has been called a special case of keystone predation, predator partitioning or the pest pressure hypothesis. The pest
Janzen–Connell_hypothesis
base, often combining on double plays – are sometimes referred to as the keystone combination. A player who makes an error fielding a ground ball may be
Glossary_of_baseball_terms
(道德经 "Book of the Way and its Virtue") of Laozi being regarded as its keystone. Taoism may be described, as does the scholar and Taoist initiate Kristofer
Religion_in_China
American science fiction television series (2022–2024)
Retrieved March 27, 2022. Littleton, Cynthia (June 21, 2022). "The 'Halo' Effect: Paramount+ Series Brings Global Audience to Streamer". Variety. Archived
Halo_(TV_series)
Pin to prevent a rotating part from sliding off an axle
elements of a complicated structure together'. Another word to this effect is keystone. Circle cotter – Ring type of retaining component Circlip – Type of
Linchpin
Restoring of wilderness environments
and pigs (as analogues for wild boar). A keystone species is a species that has a disproportionately large effect on its environment relative to its abundance
Rewilding
Semiaquatic rodent
other species, and because of their effect on other organisms in the ecosystem, beavers are considered a keystone species. Adult males and females live
Beaver
Bilateral relations
economy because the ability of the US and China to work together was the keystone of the whole arch of globalization and global trade. With that pulled out
China–United_States_relations
1914 film by Henry Lehrman
Charlie Chaplin. A one-reel comedy short, it was completed in three days at Keystone Studios in Los Angeles, California and was released for distribution on
Making_a_Living
Ethnic cleansing in the United States
across social media and garnered non-Native support for the protests. The Keystone XL pipeline, proposed in 2008, was also met with resistance by Indigenous
Native American genocide in the United States
Native_American_genocide_in_the_United_States
American actor (1887–1933)
screenwriter. He started at the Selig Polyscope Company and eventually moved to Keystone Studios, where he worked with Mabel Normand and Harold Lloyd as well as
Roscoe_Arbuckle
Extinct species of marine mammal
restock their food supplies during North Pacific expeditions. While not a keystone species, Steller's sea cows likely influenced the community composition
Steller's_sea_cow
Non-native organism causing damage to an established environment
offshore islets of Mauritius, tortoises now extinct had served as the keystone herbivores. Introduction of the non-native Aldabra giant tortoises (Aldabrachelys
Invasive_species
Innovate Pro Wrestling Juggalo Championship Wrestling Kaiju Big Battel Keystone State Wrestling Alliance Main Event Championship Wrestling MCW Pro Wrestling
List_of_NWA_Powerrr_episodes
2009–2017 U.S. presidential administration
Obama Rejects Construction of Keystone XL Oil Pipeline". The New York Times. Retrieved December 13, 2015. "Obama Vetoes Keystone XL Pipeline Bill". NBC News
Presidency_of_Barack_Obama
US hydrologic region
Arkansas, White, and Red River Basins above the points of highest backwater effect of the Mississippi River. Includes all of Oklahoma and parts of Arkansas
Arkansas–White–Red water resource region
Arkansas–White–Red_water_resource_region
2005 studio album by Dave Douglas
Keystone is the twenty-fifth album by trumpeter Dave Douglas. It was released on the Greenleaf label in 2005 and features performances by Douglas, Jamie
Keystone_(album)
repainting, which would make the 41⁄2 Alley boxcar #746. The cumulative effect of all known evidence indicates that the 41⁄2 Alley boxcar must have been
List of White Pass and Yukon Route locomotives and cars
List_of_White_Pass_and_Yukon_Route_locomotives_and_cars
name) also known as Halfworld, was an artificial planet located in the Keystone Quadrant. It was designed by the High Evolutionary as a replication of
Features of the Marvel Cinematic Universe
Features_of_the_Marvel_Cinematic_Universe
Milkweed butterfly in the family Nymphalidae
monarch butterfly: What private landowners need to know" (PDF). Keystone, Colorado: Keystone Policy Center. June 2021. Archived (PDF) from the original on
Monarch_butterfly
Wetland in Indiana and Illinois, United States
Wetlands Association (News), WEB: July 1, 2025. Podas, Mari. "Wild Rice, a Keystone Species to Minnesota Ecosystems". Wildlife Watch, U.S. Fish and Wildlife
Grand_Kankakee_Marsh
American businessman and programmer (born 1984)
initiatives, including drilling in the Arctic National Wildlife Refuge and the Keystone XL pipeline. In 2013, numerous liberal and progressive groups, such as
Mark_Zuckerberg
together peacefully and was said by David E. Smith, in 2017, to be the "keystone of the constitutional architecture" of Canada. The Crown is located beyond
Monarchy_of_Canada
French revolutionary, lawyer and politician (1758–1794)
Robespierre found a sympathetic audience. Equality before the law was the keystone of the Jacobin ideology. Beginning in October and continuing through January
Maximilien_Robespierre
2025 U.S. executive order imposing tariffs on Venezuelan oil
as well as imposing new tariffs on the country itself, which would take effect on April 2. In a post made to Truth Social, in which he made the announcement
Executive_Order_14245
Ecological niche
trophic effect. While the impact of ecosystem engineers can be as great as keystone species, they differ in their types of impact. Keystone species are
Ecosystem_engineer
American aerospace propulsion manufacturer
On 13 October 2017, it was reported that Aerojet Rocketdyne completed a keystone demonstration on a new X3 ion thruster, which is a central part of the
Aerojet_Rocketdyne
Violent 1921 American labor dispute
undercut by nonunion mines in West Virginia. One of the workers from the Keystone Mine said miners from Illinois and Pennsylvania had put up fliers about
Battle_of_Blair_Mountain
2022 Japanese anime film by Makoto Shinkai
locked doors to the Ever-After. The western keystone has become Daijin, while the location of the eastern keystone is unknown. He warns that if the worm tries
Suzume
American professional wrestling promotion
release its first line of product in August 2024. The name change to TNA took effect in January 2024, with the first event under the reinstated TNA banner being
Total Nonstop Action Wrestling
Total_Nonstop_Action_Wrestling
2006 compilation album by Merl Saunders and Jerry Garcia
(released in 1972), Fire Up (1973), Live at Keystone (1973), Keystone Encores Volume I (1988), Keystone Encores Volume II (1988), and Keepers (1997)
Well-Matched: The Best of Merl Saunders & Jerry Garcia
Well-Matched:_The_Best_of_Merl_Saunders_&_Jerry_Garcia
President of Venezuela from 1999 to 2013
social works initiated by Chávez's government relied on oil products, the keystone of the Venezuelan economy, with Chávez's administration suffering from
Hugo_Chávez
US National Historic Landmark in St. Louis, Missouri
containing the signatures of 762,000 students and others, was welded into the keystone before the final piece was set in place. On October 28, the arch was topped
Gateway_Arch
Species of rodent
burrowing rodent native to north-central Mexico. It is classified as a keystone species due to its large impact on other species and the environment. Treatment
Mexican_prairie_dog
Species of deer
rubbed off. To Inuit, for whom the caribou is a "culturally important keystone species", the months are named after landmarks in the caribou life cycle
Reindeer
Legality of sexual orientation and gender identity change efforts
Archived from the original on 24 September 2024. Retrieved 18 November 2022. Keystone-SDA/dos (2 May 2023). "First law banning conversion therapies passed in
Legality of conversion therapy
Legality_of_conversion_therapy
Form of taxation in the United States
income tax with the local earned income tax collector, such as Berkheimer, Keystone Collections, or Jordan Tax Service; an additional local services tax, potentially
State_income_tax
Ecological theory
medium-sized predator population to increase, therefore having a negative effect on the underlying prey community. The mesopredator release hypothesis offers
Mesopredator release hypothesis
Mesopredator_release_hypothesis
Broadway musical
artists of color as a part of their 51st season under the direction of Nancy Keystone. The production was originally slated to run from May 12 to June 11, 2018
Next_to_Normal
2025 order against birthright citizenship
After the Supreme Court lifted the block, the order was set to go into effect on July 27, 2025; however, it was again blocked on July 10. At least ten
Executive_Order_14160
National Football League games in the US
November 25, 2016. Retrieved November 24, 2016. See also: Pennsylvania Keystoners Hough, Lucy (3 November 2020). "Peninsula Divided: Packers vs. Lions"
NFL_on_Thanksgiving_Day
American film and television production and distribution company
Animation Alum Michael Lachance As EVP Of New Family & Animation Unit". "Keystone Cops PIC". Variety. Retrieved September 16, 2021. Schwartz, Ryan (September
Miramax
Species of fungus
Elliot SL, Hughes DP (September 2011). "Ophiocordyceps unilateralis: A keystone species for unraveling ecosystem functioning and biodiversity of fungi
Ophiocordyceps_unilateralis
Genus of flightless birds
as large as bananas and apples, is swallowed whole. Cassowaries are a keystone species of rain forests because they eat fallen fruit whole and distribute
Cassowary
2025 U.S. order to rename Denali and the Gulf of Mexico
the 2000s, librarian John R. Hébert received repeated petitions to this effect from one individual. In 2010, comedian Stephen Colbert humorously suggested
Executive_Order_14172
Church in Münster, Germany
Antiquity. On the bust's podium, which is decorated with gemstones, is a keystone with the Chi Rho. The Arm Reliquary of St Felicitas dates from around 1260
Münster_Cathedral
Type of political organization
significant rights for Locke was the right to property. He viewed it as a keystone right that was inadequately protected in the state of nature. Social contract
State_(polity)
Mountain with U.S. presidential sculptures
(Lakota: Tȟuŋkášila Šákpe, or Six Grandfathers) in the Black Hills near Keystone, South Dakota, United States. The sculptor, Gutzon Borglum, named it the
Mount_Rushmore
to the House (2004) The Keys of the Kingdom (1944) Keys to Tulsa (1997) Keystone Hotel (1935) Khaad (2014) Khaan Dost (1976) Khabardar (2006) Khaddama (2011)
List_of_films:_J–K
American lawyer and politician (born 1958)
in clean coal technologies. He voted against legislation to approve the Keystone XL pipeline. Kaine supports the use of hydraulic fracturing (fracking)
Tim_Kaine
City in Passaic County, New Jersey, US
2008), pp. 21-23. Malinconico, Joe. "Paterson's Hinchliffe Stadium is a keystone in the history of Negro Leagues baseball" Archived August 14, 2019, at
Paterson,_New_Jersey
British X-ray crystallographer (1920–1958)
(2007). "The Case of the Purloined Picture: Rosalind Franklin and the Keystone of the Double Helix". In Gavin, Eileen A.; Clamar, Aphrodite; Siderits
Rosalind_Franklin
1970 British film by Graham Stark
comedy was clearly intended to revive the silent slapstick tradition of the Keystone Cops. But the enterprise lacks pace. The film alternates between mechanical
Simon,_Simon
Large cat native to the Americas
largely a solitary, opportunistic, stalk-and-ambush apex predator. As a keystone species, it plays an important role in stabilizing ecosystems and in regulating
Jaguar
KEYSTONE EFFECT
KEYSTONE EFFECT
Female
English
English variant spelling of French Christine, KRYSTINE means "believer" or "follower of Christ."
Girl/Female
Christian & English(British/American/Australian)
Green Gemstone
Girl/Female
British, English, Greek
Gemstone
Girl/Female
Arabic, Hindu, Indian, Islamic, Muslim, Pakistani, Urdu
Red Gemstone
Girl/Female
Arabic, British, Danish, English, German, Greek, Netherlands
Form of Kerstina
Boy/Male
Indian, Kannada, Tamil
Gem; Gemstone
Girl/Female
Hindu
Rock, Jewel, A gemstone
Boy/Male
Bengali, Indian, Tamil
Gem; Gemstone (Ruby)
Boy/Male
Hindu, Indian
Gemstone for Rahu
Boy/Male
British, English, Greek
Christ-like
Girl/Female
Tamil
Rock, Jewel, A gemstone
Girl/Female
American, Australian, Bengali, British, Chinese, Christian, Danish, Dutch, English, French, Gujarati, Indian, Jamaican, Kannada, Latin, Portuguese, Punjabi, Sikh, Swedish, Tamil
Reddish; Red Colored Precious Gemstone; Red; Ruby Jewel; Reborn; The Red Gemstone
Girl/Female
Arabic, Christian, Muslim
Gemstone; Turquoise
Girl/Female
Arabic, Lebanese, Muslim
Turquoise; Precious Stone; Gemstone
Surname or Lastname
English (Kent)
English (Kent) : possibly a variant of the habitational name Cayton or a variant spelling of Keeton.
Girl/Female
American, British, Christian, English, German, Greek
Christ-like; Follower of Christ; Woman
Girl/Female
English
Christian.
Girl/Female
English American Spanish
The gemstone emerald.
Girl/Female
American, Arabic, Australian, Danish, French, Indian, Japanese, Muslim, Swedish
Red Gemstone
Girl/Female
Christian & English(British/American/Australian)
Gemstone
KEYSTONE EFFECT
KEYSTONE EFFECT
Girl/Female
Hindu
Absorbed
Girl/Female
Indian
Patience
Girl/Female
Hindu
Lotus
Boy/Male
Muslim
Judge, Honest, Upright, Justice, Sincere, Just
Girl/Female
Gujarati, Hindu, Indian, Sanskrit, Telugu
Hymn; Words; It's is Like a Slokam in Any Language
Girl/Female
Indian
Beautiful
Girl/Female
British, English
Rare Ruby; Most Beauty
Boy/Male
Greek, Indian, Japanese, Sanskrit, Swedish
Pure; Name of a Sage
Girl/Female
Tamil
Awakening, Love
Boy/Male
Arabic
Servant of the Glorious One
KEYSTONE EFFECT
KEYSTONE EFFECT
KEYSTONE EFFECT
KEYSTONE EFFECT
KEYSTONE EFFECT
n.
The central or topmost stone of an arch. This in some styles is made different in size from the other voussoirs, or projects, or is decorated with carving. See Illust. of Arch.
n.
Eye agate. See under Eye.
n.
One of a large class of organic substances resembling the aldehydes, obtained by the distillation of certain salts of organic acids and consisting of carbonyl (CO) united with two hydrocarbon radicals. In general the ketones are colorless volatile liquids having a pungent ethereal odor.
n.
The ketone of palmitic acid.
n.
See Felsite.
n.
Pisolite.
n.
See Curbstone.
n.
A keystone.
n.
The ketone of margaric acid.
n.
A liquid ketone obtained by heating calcium butyrate.
n.
A silver coin of Portugal, worth about sixpence sterling, or about eleven cents.
n.
A ketone of valeric acid obtained as an oily liquid.
n.
The ketone of oenanthic acid.
n.
A small, lenticular, calcareous body, esp. an operculum of a small marine shell of the family Turbinidae, used to remove a foreign substance from the eye. It is put into the inner corner of the eye under the lid, and allowed to work its way out at the outer corner, bringing with it the substance.
n.
Alt. of Jewstone
n.
The shoulder of a joggled keystone.
n.
The keystone of an arch.
n.
The hypothetical ketone of suberic acid.
n.
The ketone of lauric acid.
n.
A large clavate spine of a fossil sea urchin.