![[Producing ghostly illusion by use of magic lantern. 18th c.]](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE4MzEvMDEvMDEvcHJvZHVjaW5nLWdob3N0bHktaWxsdXNpb24tYnktdXNlLW9mLW1hZ2ljLWxhbnRlcm4tMTh0aC1jLTY0MC5qcGc%3D/40/25/webp "[Producing ghostly illusion by use of magic lantern. 18th c.]")
[Producing ghostly illusion by use of magic lantern. 18th c.]
Illus. in: E.G. Robertson, Mémoires : récréatifs, scientifiques et anecdotiques, frontispiece (Houdini Collection). Reference copy in SSF (Gr) - Magicians and Magic. This record contains unverified, old data fr... More
![[Optical illusion disc with man and frog]](https://cache.getarchive.net/Prod/thumb/cdn18/L3Bob3RvLzIwMTkvMTEvMDEvb3B0aWNhbC1pbGx1c2lvbi1kaXNjLXdpdGgtbWFuLWFuZC1mcm9nLTcyNjJlZi0xMDI0LmpwZw%3D%3D/40/32/webp "[Optical illusion disc with man and frog]")
[Optical illusion disc with man and frog]
The disc is spun displaying the illusion of motion of a ball passing between a frog in a circle at the center of the disc and a man in a circle at the outer edge of the disc. Published in: McLean's optical illu... More
![[Optical illusion disc with birds, butterflies, and a man jumping]](https://cache.getarchive.net/Prod/thumb/cdn18/L3Bob3RvLzIwMTkvMTEvMDMvb3B0aWNhbC1pbGx1c2lvbi1kaXNjLXdpdGgtYmlyZHMtYnV0dGVyZmxpZXMtYW5kLWEtbWFuLWp1bXBpbmctNGRmMGE5LTEwMjQuanBn/40/31/webp "[Optical illusion disc with birds, butterflies, and a man jumping]")
[Optical illusion disc with birds, butterflies, and a man jumping]
The disc is spun displaying the illusion of motion of a man jumping from a pole in a circle at the center of the disc and of a birds and butterflies in flight in a circle at the outer edge of the disc. Publishe... More
![[Optical illusion disc with a face catching a ball and a man with blackface taking a bow]](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzIwMTkvMDkvMjkvb3B0aWNhbC1pbGx1c2lvbi1kaXNjLXdpdGgtYS1mYWNlLWNhdGNoaW5nLWEtYmFsbC1hbmQtYS1tYW4td2l0aC1ibGFja2ZhY2UtZTY4NjIyLTEwMjQuanBn/40/32/webp "[Optical illusion disc with a face catching a ball and a man with blackface taking a bow]")
[Optical illusion disc with a face catching a ball and a man with blac...
The disc is spun displaying the illusion of motion of a face catching a ball in a circle at the center of the disc and a man with blackface taking a bow in a circle at the outer edge of the disc. Published in: ... More
![[Optical illusion disc with somersaults and horseback riding]](https://cache.getarchive.net/Prod/thumb/cdn18/L3Bob3RvLzIwMTkvMTAvMDYvb3B0aWNhbC1pbGx1c2lvbi1kaXNjLXdpdGgtc29tZXJzYXVsdHMtYW5kLWhvcnNlYmFjay1yaWRpbmctZDY3YWQ2LTEwMjQuanBn/40/32/webp "[Optical illusion disc with somersaults and horseback riding]")
[Optical illusion disc with somersaults and horseback riding]
The disc is spun displaying the illusion of motion of a figure doing somersaults in a circle at the center of the disc and a man horseback riding in a circle at the outer edge of the disc. Published in: McLean'... More
![[Optical illusion disc with man pumping water]](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzIwMTkvMDkvMjYvb3B0aWNhbC1pbGx1c2lvbi1kaXNjLXdpdGgtbWFuLXB1bXBpbmctd2F0ZXItNWVlM2YyLTEwMjQuanBn/40/31/webp "[Optical illusion disc with man pumping water]")
[Optical illusion disc with man pumping water]
The disc is spun displaying the illusion of motion of a man pumping water in a circle at the outer edge of the disc. Published in: McLean's optical illusions; or magic panorama. London, T. McLean, 1833. Exhibit... More
![[Optical illusion disc with man jumping rope and a man sticking out his tongue]](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzIwMTkvMDkvMTUvb3B0aWNhbC1pbGx1c2lvbi1kaXNjLXdpdGgtbWFuLWp1bXBpbmctcm9wZS1hbmQtYS1tYW4tc3RpY2tpbmctb3V0LWhpcy10b25ndWUtNGI4Y2JhLTEwMjQuanBn/40/32/webp "[Optical illusion disc with man jumping rope and a man sticking out his tongue]")
[Optical illusion disc with man jumping rope and a man sticking out hi...
The disc is spun displaying the illusion of motion of a man with black-face jumping rope in a circle at the center of the disc and of a man sticking out his tongue in a circle at the outer edge of the disc. Pub... More
![[Optical illusion disc with two men throwing and catching cakes and stars]](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzIwMTkvMTAvMDEvb3B0aWNhbC1pbGx1c2lvbi1kaXNjLXdpdGgtdHdvLW1lbi10aHJvd2luZy1hbmQtY2F0Y2hpbmctY2FrZXMtYW5kLXN0YXJzLTZlNGQzOS0xMDI0LmpwZw%3D%3D/40/32/webp "[Optical illusion disc with two men throwing and catching cakes and stars]")
[Optical illusion disc with two men throwing and catching cakes and st...
The disc is spun displaying the illusion of motion of a man tossing cakes and stars in a circle at the center of the disc to a man seated on a box with a crown on it in a circle at the outer edge of the disc. P... More
Illusion, 19th century - Art nouveau public domain image
Henri-Jules-Ferdinand Bellery-Desfontaines (French, Paris 1867–1910) Public domain reproduction of art nouveau poster, cover, free to use, no copyright restrictions image - Picryl description
![[Harry Houdini performs the great milk can escape]](https://cache.getarchive.net/Prod/thumb/cdn4/L3RodW1ibmFpbC8xOTA4LzAxLzAxL2hhcnJ5LWhvdWRpbmktcGVyZm9ybXMtdGhlLWdyZWF0LW1pbGstY2FuLWVzY2FwZS0yMDAuanBn/40/40/webp "[Harry Houdini performs the great milk can escape]")
[Harry Houdini performs the great milk can escape]
Public domain photograph of 3d object museum collection, metal, no copyright restrictions image - Picryl description Harry Houdini was a Hungarian-American magician and escapologist, born in Budapest in 1874. ... More
Joke Photograph: Rotarians Holding Pat Rood's 500 Pound Salmon
193-.Black and white photograph..To obtain high quality and larger reproductions of this image please visit the Galt Museum & Archives website: www.galtmuseum.com/archives.htm ( http://www.galtmuseum.com/archiv... More
![Glenn T. Seaborg standing in front of the Periodic Table with the Ion Exchanger illusion column of Actnide Elements, May 19, 1950. See also XBD9811-03038.tif for similar. Morgue 1956-6 (P-6) [Photographer: Donald Cooksey]](https://cache.getarchive.net/Prod/thumb/cdn10/L3Bob3RvLzE5NTAvMDQvMTkvZ2xlbm4tdC1zZWFib3JnLXN0YW5kaW5nLWluLWZyb250LW9mLXRoZS1wZXJpb2RpYy10YWJsZS13aXRoLXRoZS1pb24tZXhjaGFuZ2VyLWMzNGJmZi0xMDI0LmpwZw%3D%3D/40/50/webp "Glenn T. Seaborg standing in front of the Periodic Table with the Ion Exchanger illusion column of Actnide Elements, May 19, 1950. See also XBD9811-03038.tif for similar. Morgue 1956-6 (P-6) [Photographer: Donald Cooksey]")
Glenn T. Seaborg standing in front of the Periodic Table with the Ion ...
Photographs Documenting Scientists, Special Events, and Nuclear Research Facilities, Instruments, and Projects at the Berkeley Lab
![Glenn T. Seaborg standing in front of the Periodic Table with the Ion Exchanger illusion column of Actnide Elements, May 19, 1950. See also XBD 9607-03536.tif for similar. Morgue 1956-6 (P-4) [Photographer: Donald Cooksey]](https://cache.getarchive.net/Prod/thumb/cdn10/L3Bob3RvLzE5NTAvMDQvMTkvZ2xlbm4tdC1zZWFib3JnLXN0YW5kaW5nLWluLWZyb250LW9mLXRoZS1wZXJpb2RpYy10YWJsZS13aXRoLXRoZS1pb24tZXhjaGFuZ2VyLTlmNDQ1YS0xMDI0LmpwZw%3D%3D/40/48/webp "Glenn T. Seaborg standing in front of the Periodic Table with the Ion Exchanger illusion column of Actnide Elements, May 19, 1950. See also XBD 9607-03536.tif for similar. Morgue 1956-6 (P-4) [Photographer: Donald Cooksey]")
Glenn T. Seaborg standing in front of the Periodic Table with the Ion ...
Photographs Documenting Scientists, Special Events, and Nuclear Research Facilities, Instruments, and Projects at the Berkeley Lab
An optical illusion makes two crewmen appear as one Sailor working on ...
The original finding aid described this photograph as: Base: USS Ingersoll (DD 990) Country: Pacific Ocean (POC) Scene Camera Operator: PHC Chet King, USN Release Status: Released to Public Combined Militar... More
A view of artwork on the nose of a B-52 Stratofortress aircraft known ...
The original finding aid described this photograph as: Country: Unknown Scene Camera Operator: Earl Vroman Release Status: Released to Public Combined Military Service Digital Photographic Files
A view of artwork entitled "Grand Illusion" on the nose of a B-1B Lanc...
The original finding aid described this photograph as: Country: Unknown Scene Camera Operator: SSGT Roach Release Status: Released to Public Combined Military Service Digital Photographic Files
An optical illusion places Lady Margaret Thatcher, former Prime Minist...
An optical illusion places Lady Margaret Thatcher, former Prime Minister of Great Britain, under an external tank in the Vehicle Assembly Building. In reality, the ET is behind her, waiting in the transfer aisl... More
US Air Force (USAF) STAFF Sergeant (SSGT) Walter Campbell, performs a ...
The original finding aid described this photograph as: Base: Biloxi State: Mississippi (MS) Country: United States Of America (USA) Scene Camera Operator: Unknown Release Status: Released to Public Combine... More
An optical illusion of a fire spewing M998 High-Mobility Multipurpose ...
The original finding aid described this photograph as: Subject Operation/Series: IRAQI FREEDOM Base: Basrah Country: Iraq (IRQ) Scene Camera Operator: MSGT Howard J. Farrell, USMC Release Status: Released ... More
International Space Station (ISS)
Many odd looking moon photos have been captured over the years by astronauts aboard the International Space Station. Even so, this photograph, taken by the crew over Russia on May 11, 2003, must have come as a ... More
Atmospheric Illusion - NASA Saturn images
Atmospheric Illusion NASA/JPL/Space Science Institute Public domain photograph of a solar system, planet, space exploration, free to use, no copyright restrictions image - Picryl description
KENNEDY SPACE CENTER, FLA. - The camera captures an optical illusion...
KENNEDY SPACE CENTER, FLA. - The camera captures an optical illusion of a dragonfly above the reedy water near Launch Pad 39B seems to be heading for Space Shuttle Atlantis. The shuttle, sitting on the mobil... More
Photographer Carol M. Highsmith joins Sharon Tyson and visiting childr...
Public domain photograph - historical image of Alabama, United States, free to use, no copyright restrictions image - Picryl description
Photographer Carol M. Highsmith joins Sharon Tyson and visiting childr...
Title, date, subject note, and keywords provided by the photographer. Credit line: The George F. Landegger Collection of Alabama Photographs in Carol M. Highsmith's America, Library of Congress, Prints and Phot... More
Photographer Carol M. Highsmith joins Sharon Tyson and visiting childr...
Title, date, subject note, and keywords provided by the photographer. Credit line: The George F. Landegger Collection of Alabama Photographs in Carol M. Highsmith's America, Library of Congress, Prints and Phot... More
Photographer Carol M. Highsmith joins Sharon Tyson and visiting childr...
Title, date, subject note, and keywords provided by the photographer. Credit line: The George F. Landegger Collection of Alabama Photographs in Carol M. Highsmith's America, Library of Congress, Prints and Phot... More
Photographer Carol M. Highsmith joins Sharon Tyson and visiting childr...
Public domain photograph - historical image of Alabama, United States, free to use, no copyright restrictions image - Picryl description
Photographer Carol M. Highsmith joins Sharon Tyson and visiting childr...
Title, date, subject note, and keywords provided by the photographer. Credit line: The George F. Landegger Collection of Alabama Photographs in Carol M. Highsmith's America, Library of Congress, Prints and Phot... More
Photographer Carol M. Highsmith joins Sharon Tyson and visiting childr...
Title, date, subject note, and keywords provided by the photographer. Credit line: The George F. Landegger Collection of Alabama Photographs in Carol M. Highsmith's America, Library of Congress, Prints and Phot... More
Photographer Carol M. Highsmith joins Sharon Tyson and visiting childr...
Title, date, subject note, and keywords provided by the photographer. Credit line: The George F. Landegger Collection of Alabama Photographs in Carol M. Highsmith's America, Library of Congress, Prints and Phot... More
Photographer Carol M. Highsmith joins Sharon Tyson and visiting childr...
Title, date, subject note, and keywords provided by the photographer. Credit line: The George F. Landegger Collection of Alabama Photographs in Carol M. Highsmith's America, Library of Congress, Prints and Phot... More
Photographer Carol M. Highsmith joins Sharon Tyson and visiting childr...
Title, date, subject note, and keywords provided by the photographer. Credit line: The George F. Landegger Collection of Alabama Photographs in Carol M. Highsmith's America, Library of Congress, Prints and Phot... More
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, spa...
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery is visible on Launch Pad 39A before the rotating service structure, which protects it from the elements and provides ac... More
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, the...
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, the crawler-transporter that carried space shuttle Discovery from the Vehicle Assembly Building to Launch Pad 39A, moves toward the pad perimet... More
An Optical Illusion, JPL/NASA images
An Optical Illusion NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Face Illusion in the Cosmic Clouds
In this image of PSR B1509-58 about 170,000 light-years from Earth, X-rays from NASA Chandra in gold are seen along with infrared data from NASA Wide-field Infrared Survey Explorer WISE telescope in red, green ... More
Icy Curtain Eruptions on Enceladus Create an Illusion of Discrete Jets...
This simulation, which begins and ends with a real image from NASA Cassini spacecraft, demonstrates how the appearance of discrete jets could be an optical illusion that varies based on viewing geometry. NASA/J... More
Army Reservist Chasity Kuczer swims breaststroke during
Army Reservist Chasity Kuczer swims breaststroke during the 2015 Department of Defense Warrior Games in Manassas, Va., June 27, 2015. The swimming event portion of the games was held at the Freedom Aquatic and ... More
A brown and white geometric pattern. Fabric texture conceptual, backgr...
A geometric pattern with a square in the middle / A brown and white geometric pattern / Public domain stock illustration.
A blurry photo of a person holding a tennis racquet. Abstract graphics...
A blue and black background with a circular pattern / A blurry photo of a person holding a tennis racquet / Public domain stock illustration.
A multicolored background with a burst of light. Radiating lines dimen...
Abstract background with a sunburst pattern / A multicolored background with a burst of light / Public domain stock illustration.
A computer generated image of a spiral design. Background nebulous fog...
A fractal image of a flower / A computer generated image of a spiral design / Public domain stock illustration.
A man riding a skateboard through a purple and white room. Disturbed i...
A drawing of a purple building with a man sitting on the floor / A man riding a skateboard through a purple and white room / Public domain stock illustration.
A blue and white striped pattern with squares. Geometric shapes stripe...
The pattern is based on the pattern of the same pattern / A blue and white striped pattern with squares / Public domain stock illustration.
A reflection of a building in a glass building Architecture mirroring ...
Architecture stock photograph: The building is reflected in the glass / A reflection of a building in a glass building.
A picture of a forest with a lot of trees. Disturbed illusion mood.
A photo of a tree in a forest / A picture of a forest with a lot of trees / Public domain stock illustration.
Graffiti building mural building. A large mural on the side of a build...
Architecture stock photograph: A large building with a large mural of a man and a woman / A large mural on the side of a building. Stock photo: A large building with a large mural of a man and a woman / A larg... More
A painting of a man sitting on top of a rock. Art artistic abstract.
And / A painting of a man sitting on top of a rock / Public domain stock illustration.
A close up of a wooden surface with different shapes of eggs. Awele bo...
Public domain texture / The wood is a bit different from the wood / The wood is a great way to add a little bit of color to the wood. Public domain textures and patterns: The wood is a bit different from the w... More
A red and white striped background with a circular design. Fractals ab...
The effect of hard light. the effect of hard light. fragment / A red and white striped background with a circular design / Public domain stock illustration.
A cat sitting in the middle of a tunnel. Cat misfortune superstition.
Find the best free stock photos of cats. Download all Cat images and use as you want: for free, no copyright restrictions, no attribution required!.
A black cat sitting on top of a red calendar. Friday calendar cat.
Find the best free stock photos of cats. Download all Cat images and use as you want: for free, no copyright restrictions, no attribution required!.
A blue and white checkered pattern with a blue center. Fabric textile ...
A circular pattern of blue jeans / A blue and white checkered pattern with a blue center / Public domain stock illustration.
A digital painting of a blue and green wave. Abstract graphics water w...
The art of the teal / A digital painting of a blue and green wave / Public domain stock illustration.
Wall painting multistory house art building. A tall building with a mu...
Architecture stock photograph: A building with a large mural of buildings on it / A tall building with a mural on the side of it.
A picture of a water surface with ripples. Waves circles wave concentr...
A water ripple in the water / A picture of a water surface with ripples / Public domain stock illustration.
A green and red background with vertical lines. Spectrum psychedelic b...
Green and red lines on a black background / A green and red background with vertical lines / Public domain stock illustration.
A black and white image of a spiral design. Rectangles pattern arrange...
A computer generated image of a pattern of cell phones / A black and white image of a spiral design / Public domain stock illustration.
A close up of a glass with a clock inside of it. Time background struc...
A clock with roman numerals in a circle / A close up of a glass with a clock inside of it / Public domain stock illustration.
A bunch of golf balls sitting on top of a table. Molecules abstract gr...
A close up of a golf ball / A bunch of golf balls sitting on top of a table / Public domain stock illustration.
Two people are facing each other in a colorful circle. Teachers friend...
The words we are not friends in a circle / Two people are facing each other in a colorful circle / Public domain stock illustration.
A purple and blue triangle with the word infinity on it. Infinite opti...
The infinity logo - infinity logo / A purple and blue triangle with the word infinity on it / Public domain stock illustration.
A picture of a colorful background with circles. Fractal circles abstr...
Free inspirational quotes images. Download inspirational images. Use free inspirational pictures without any copyright restrictions.
A close up of water ripples on a body of water. Wave concentric waves ...
Rhythm of the water 1024x768 / A close up of water ripples on a body of water / Public domain stock illustration.
A circular pattern of black and yellow flowers. Expression graphic art...
A pattern made from a pattern / A circular pattern of black and yellow flowers / Public domain stock illustration.
Arrangement aesthetics aesthetic building. A computer generated image ...
Architecture stock photograph: A green and yellow background with a pattern of squares / A computer generated image of green squares.
Arrangement aesthetics aesthetic building. A digital image of a green ...
Architecture stock photograph: Abstract background with a pattern of squares / A digital image of a green and white square pattern.
Colorful color arrangement building. A colorful tiled floor with squar...
Architecture stock photograph: Wallpapers of the day : colorful squares wallpapers / A colorful tiled floor with squares of different colors.
Pool holiday concerns, travel vacation. A bunch of white umbrellas han...
Architecture stock photograph: A row of white beach chairs with umbrellas / A bunch of white umbrellas hanging from a line.
A red checkered pattern is shown in this image. Texture brick wall, ba...
Red metal mesh texture for a background / A red checkered pattern is shown in this image / Public domain stock illustration.
A man and a woman are facing each other. Unknown identity undiscovered...
Digital art selected for the / A man and a woman are facing each other / Public domain stock illustration.
A black and white photo of a circular pattern. Wave motion waves circl...
A photograph of a water ripple / A black and white photo of a circular pattern / Public domain stock illustration.
A black and blue striped wall with a clock. Geometric perception aqua,...
Stock photo: A black and blue striped pattern on a black background / A black and blue striped wall with a clock.
A computer generated image of a green star. Fractal abstract design, b...
Public domain texture / The effect of the dark. fragment / The effect of the dark. very vivid colours. fragment. Public domain textures and patterns: The effect of the dark. fragment / The effect of the dark. ... More
A computer generated image of a spiral. Background nebulous fog, backg...
Abstract digital art - abstract lines on a blue background by / A computer generated image of a spiral / Public domain stock illustration.
A man standing in front of a wall of multicolored lines. Illusion imag...
Stock photography: A man standing in front of a colorful curtain / A man standing in front of a wall of multicolored lines.
Arrangement aesthetics aesthetic building. A colorful swirl with a bla...
Architecture stock photograph: A colorful spiral with a black background / A colorful swirl with a black background.
Arrangement aesthetics aesthetic building. A multicolored abstract bac...
Architecture stock photograph: Abstract background of colored lines on a black background / A multicolored abstract background with lines.
Arrangement aesthetics aesthetic building. A colorful spiral design wi...
Architecture stock photograph: The art of the motion of the universe / A colorful spiral design with a black center.
Arrangement aesthetics aesthetic building. A computer generated image ...
Architecture stock photograph: The effect of the dark. fragment / A computer generated image of a colorful flower.
A multicolored image of a cross on a black background. Strudel vortex ...
The art of fractal art / A multicolored image of a cross on a black background / Public domain stock illustration.
Color color table chromaticity diagram building. A black background wi...
Architecture stock photograph: A spiral of colored squares / A black background with a multicolored spiral design.
A black and white photo of a bunch of items. Magic conjure conjurer.
Visual patterns: A black table with a bucket, cups, and other items / A black table with a black hat, a white glove, a black hat, and some silver cups - public domain stock photo.
A green and white swirly background with a circular design. Swirl spir...
Abstract background with a spiral pattern / A green and white swirly background with a circular design / Public domain stock illustration.
A couple of rings that are in the sky. Abstract illusion modern.
A spiral shaped object in the sky / A couple of rings that are in the sky / Public domain stock illustration.
A picture of a blue and white tiled wall. Arrangement blue abstract, b...
Abstract pattern of a flower. abstract pattern of a flower royalty free illustration / A picture of a blue and white tiled wall / Public domain stock illustration.
A blurry picture of a city at night. Bokeh night travel
A blurry photo of a city street at night / A blurry picture of a city at night / Public domain stock photo.
A colorful square pattern that looks like an optical illusion. Maze ra...
Puzzle pieces. Free images of a puzzle. Use free photos of puzzles without any copyright restrictions.
A silhouette of a woman with words in her face. Unknown identity undis...
A silhouette of a woman with words in her face / A silhouette of a woman with words in her face / Public domain stock illustration.
A blue and white geometric pattern. Geometric pattern blue, background...
A seamless pattern of blue and white squares / A blue and white geometric pattern / Public domain stock illustration.
Arrangement aesthetics aesthetic building. A circular pattern with man...
Architecture stock photograph: A kaleidoscope of abstract shapes and colors / A circular pattern with many different colors.
Two children holding hands in front of a painting. Children brothers a...
A boy and girl holding hands on a swing / Two children holding hands in front of a painting / Public domain stock illustration.
A colorful spiral design with multiple colors. Wave concentric waves c...
A colorful spiral with a red and blue background / A colorful spiral design with multiple colors / Public domain stock illustration.
The sun is shining brightly over the water. Flowers digital background...
The sun is shining through the water / The sun is shining brightly over the water / Public domain stock illustration.
A black circle surrounded by orange lines. Abstract lines background, ...
The eye of the black hole / A black circle surrounded by orange lines / Public domain stock illustration.