< geometrical illusion (illusion of shape) >robvdw/practicum_illusions/demos...a catalogue of...

Catalogue of illusions

http://www.psy.ritsumei.ac.jp/˜akitaoka/cataloge.html[18-11-2009 15:16:57]

A catalogue of illusionsAccess since September 22, 2004

Renewal April 2008

< Geometrical illusion (illusion of shape) >

Müller-Lyerillusion

The two horizontal bars are the same inlength but the lower one appears to bemuch longer than the upper one.

Click this image,

and a high-resolution bitmap of the

Müller-Lyer illusion will be available.

Ebbinghausillusion

(Titchener

illusion)

(Ebbinghaus

illusion of

size)

(Ebbinghaus

size illusion)

(Ebbinghaus

areal illusion)

A circle is surrounded by smaller circlesappears to be larger than the circle of thesame size surrounded by larger circles.

Delboeufillusion,underestimationof the outercircle

A circle appears to be smaller than it iswhen a slightly smaller circle is drawn init.

http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=5979http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6163http://www.psy.ritsumei.ac.jp/~akitaoka/Delboeuf03m.jpghttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6182



Delboeufillusion,overestimationof the innercircle

A circle appears to be larger than it iswhen it is surrounded by a slightly largercircle.

Delboeufillusion,underestimationof the innercircle

A circle appears to be smaller than it iswhen it is surrounded by a much largercircle.

Ponzo illusion

The object nearer to the apex appears tobe larger than the other of the same size.

Ehrensteinillusion

(Ehrenstein

1925)

The square appears to be distorted inwhich the right side appears to be tapered.

Jastrow illusion

The two curved figures are of the samesize but the inner one appears to be largerthan the outer one. Actually, this illusionwas first presented by Müller-Lyer(1889), not by Jastow (1891).

(the upper image)

http://www.psy.ritsumei.ac.jp/~akitaoka/Delboeuf01m.jpghttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6183http://www.psy.ritsumei.ac.jp/~akitaoka/Delboeuf02m.jpghttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6187http://www.psy.ritsumei.ac.jp/~akitaoka/HVPonzoillusions2.jpghttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6041http://www.psy.ritsumei.ac.jp/~akitaoka/ML1889Fe.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/ML1889Fe.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/ML1889Fe.htmlhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6189



Poggendorffillusion

The right oblique line segment appears tobe upper than the extension of the leftone, though they are just aligned.

Zöllner illusion

The horizontal lines appear to tilt to theright and the left alternately. This illusionis characterized by acute-angle expansion.

Basic image

Image with five induced lines

Hering illusion

The parallel line appear to curve outward.

Café Wallillusion

The gray line is horizontal but appears totilt counterclockwise in the upper image.In the lower image, the horizontal graylines appear to tilt clockwise,counterclockwise, clockwise,counterclockwise from the top to thebottom, respectively. When the line isblack, the illusions is called theMünsterberg illusion.

Basic image

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Image with four induced lines

checkeredillusion

The black line is horizontal but appears totilt down to the right.

Basic image

Enhanced version

Enhanced version, two dimensional

(dice type)

Illusion ofshifted

gradations

The gray line is horizontal but appears totilt down to the left.

Illusion of

striped cords

The black-and-white line is horizontal butappears to tilt down to the left.

http://www.psy.ritsumei.ac.jp/~akitaoka/cafewall.htmlhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=5953http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6170http://www.psy.ritsumei.ac.jp/~akitaoka/checkerede.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/checkerede.htmlhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6037http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=5947http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6038http://www.psy.ritsumei.ac.jp/~akitaoka/shiftgrae.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/shiftgrae.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/shiftgrae.htmlhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=5951http://www.psy.ritsumei.ac.jp/~akitaoka/stripedcorde.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/stripedcorde.htmlhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6022



The limitedcase of theCafé Wall

illusion

Please read this paper:

Kitaoka, A., Pinna, B., and Brelstaff, G.(2004). Contrast polarities determine thedirection of Cafe Wall tilts. Perception,33, 11-20.

cf. Cafe Wall illusion shown below

( )

Reverse CaféWall illusion

The black-and-white line is horizontal butappears to tilt clockwise.

Illusion of Y-junctions

In this image, the middle horizontal edgeappears to tilt counterclockwise (Kitaoka,Pinna and Brelstaff, 2001, 2004).

Illusion offringed edges

In this image, the middle horizontal edgeappears to tilt counterclockwise (Kitaoka,Pinna and Brelstaff, 2001, 2004).

Illusion ofshifted edges

In this image, the whole row appears totilt counterclockwise though shiftedrectangles are horizontally aligned(Kitaoka, Pinna and Brelstaff, 2001,2004).

When slightly tilted line segments arealigned horizontally like the figure, the

http://www.psy.ritsumei.ac.jp/~akitaoka/cafekihone.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/cafekihone.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/cafekihone.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/cafekihone.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/cafekihone.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/CafeWall.pdfhttp://www.psy.ritsumei.ac.jp/~akitaoka/reversecafewall.jpghttp://www.psy.ritsumei.ac.jp/~akitaoka/cafewall2.jpghttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6198http://www.psy.ritsumei.ac.jp/~akitaoka/YjunctionsR.jpghttp://www.psy.ritsumei.ac.jp/~akitaoka/Yjunctione.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/Yjunctione.htmlhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=5949http://www.psy.ritsumei.ac.jp/~akitaoka/fringede.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/fringede.htmlhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=5946http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=5948



Fraser illusion

whole array appears to tilt toward the tiltof the line elements. This is a reversal ofthe Zöllner illusion or acute-anglecontraction.

Popple illusion

The phase-shift illusion. When Gaborpatches are aligned vertically and thephase of carriers is adequately shifted, therow of the envelope windows appear totilt toward the shift.

Oppel-Kundtillusion

The physical center is the second onefrom the right, which appears to shiftrightward.

Helmholtzsquare

The vertical side of a square appears to belonger than the horizontal side when thesquare is filled with a horizontal grating,and vice versa.

Helmholtz'sangle expansion

The vertical appears to tiltcounterclockwise while the horizntalappears to tilt clockwise.

The vertical line and the horizontal lineare the same in length but the formerappears to be longer that the latter.

http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6175http://www.psy.ritsumei.ac.jp/~akitaoka/popple8.jpghttp://www.psy.ritsumei.ac.jp/~akitaoka/popple.htmlhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6172http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6186



Fick illusion

Bourdon

illusion

The upper side of the left-lower triangle isactually aligned with the upper side of theright-upper triangle, the former appears totilt counterclockwise while the latterclockwise.

Giovanelliillusion

Each dot surrounded by a larger circleappears to shift in position away from thecenter of the circle.

Shepardillusion

(table-topillusion)

The left parallelogram appears to beslimmer than the right one, though theyare identical in shape and size.

Shepard, R. N. (1990) Mind sights:original visual illusions, ambiguities,and other anomalies, with acommentary on the play of mind inperception and art. New York:Freeman.

According to the book above, the

original was first reported in 1981:

Shepard, R. N. (1981) Psychophysicalcomplementarity. in Kubovy, M. andPomeranz, J. (Eds.), PerceptualOrganization, Hillsdale, NJ: LawrenceErlbaum Associates, pp. 279-341. (seep.298)

Assimilation orcapture to the

Shepardillusion

An image drawn in the parallelogram ofthe Shepard illusion appears to bedistorted, captured by the Shepardillusion.

http://www.psy.ritsumei.ac.jp/~akitaoka/notes.htmlhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6176http://www.psy.ritsumei.ac.jp/~akitaoka/bourdon.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/bourdon.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/bourdon.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/Giovanelli.gifhttp://www.psy.ritsumei.ac.jp/~akitaoka/Giovanellie.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/Giovanellie.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/Shepardillusion.jpghttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6164http://www.psy.ritsumei.ac.jp/~akitaoka/Shepardillusionsuisen.jpghttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6165



Fraser's spiralillusion

Concentric circles appear to be spirals.

Adobe Illustrator file (version 8)

< Illusion of brightness or lightness) >

brightnesscontrast

(lightnesscontrast)

A gray area surrounded by a darkerbackground appears to be brighter(lighter) than it is, while a gray areasurrounded by a brighter (lighter)background appears to be darker than it is.

brightnessassimilation(lightness

assimilation)

The gray background with black linesappears to be darker while the graybackground with white lines appears to belighter.

Anderson'slightnessillusion

(Anderson andWinawer,

2005)

The inset surrounded by the darkerbackground appears to be lighter than thesame pattern surrounded by the brighterbackground. The continuity of texture iscritical in this illusion.

gratinginduction

(McCourt,1982)

The physically homogeneous grayoccluder shows an apparent brightnessgrating that is counterphase with theluminance grating. When the occluder isof the lowest or highest luminance of thegrating, visual phantoms are observed.

http://www.psy.ritsumei.ac.jp/~akitaoka/fraserspiral1.jpghttp://www.psy.ritsumei.ac.jp/~akitaoka/FraSpr-e.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/FraSpr-e.htmlhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6168http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6359http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6174http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6171http://www.psy.ritsumei.ac.jp/~akitaoka/gratinginduction01.jpghttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6305



White's effect

(White, 1979)

A gray grating placed on the black phaseappears to be lighter than as it is whileone placed on the white phase appears tobe darker as it is. In this image, the grayin the left half appears to be lighter thanthat in the right half, though they areidentical in lightness. White's effect canbe thought of as the achromatic Munkerillusion.

White's dottedlightnessillusion

(White, 1982)

The gray square in the left half appears tobe lighter than that in the right half,though they are the same in lightness.This illusion does not depend on T-junctions.

Ehrenstein'sfigure

(Ehrenstein,1941)

The illusory circles appear to be brighterthan the background though they are ofthe same luminance.

Hermann gridillusion

(Hermann,

1870)

There appear to be dark dots on thecrosses of white streets.

Scintillatinggrid illusion

Illusory black dots appear to scintillate inwhite circles. cf. Bergen's illusion

->

http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6016http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6169http://www.psy.ritsumei.ac.jp/~akitaoka/Bergene.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/scintillatinggridillusion.jpghttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6192



Bergen illusion Black flashes appear to scintillate in whitecrosses.

Mach band

Illusory dark (D) or light (L) lines areobserved at the borders betweenhomogeneous luminance fields andluminance gradients.

Craik-O'Brien-Cornsweet

effect

It appears as if there were dark, light, darkand light fields when seen from the left tothe right, they are actually of the sameluminance.

When a dark image and a light image areconnected to each other, the border of the

http://www.psy.ritsumei.ac.jp/~akitaoka/Bergene.htmlhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6370http://www.psy.ritsumei.ac.jp/~akitaoka/COCE05.jpghttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6173



Chevreulillusion

former appears to be darker while that ofthe latter appears to be lighter. Thisillusion is frequently called the "Machband", which is wrong, however.

Vasarelyillusion

(Jameson andHurvich, 1975;Morgan, 1996;Ninio, 2001;

Martinez-Conde and

Macknik, 2001)

The diagonals appear to be light in theright image while they appear to be darkin the right image, though there are noluminance changes in diagonals. Jamesonand Hurvich (1975, Leonardo, 8, 125-131,p.129) pointed out this effect in works ofVictor Vasarely, the most famous opartist.

Catalogue ofbrightness or

lightnessillusions

"ProfessorMark McCour's

talk inRitsumeikan

2008" version

< Illusion of color >

Color contrast

(Chromatic

contrast)

When a small patch is surrounded by acolor field, the patch appears to be tintedin the opponent color of the surroundingfield. In this image, a gray patch appearsto be tinted reddish when surrounded by agreen field.

The gray background with blue linesappears to be bluish while the gray

http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=5794http://www.psy.ritsumei.ac.jp/~akitaoka/BrightnessIllusionCatalogue2008.dochttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6371http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6190



Colorassimilation

(Chromatic

assimilation)

background with yellow lines appears tobe yellowish.

Colorassimilation

The orange and purple-red shown in theupper row are the same red, and theyellowish-green and bluish greendisplayed in the lower row are the samegreen.

De Valois, andDe Valois's(1988) colorassimilation

The orange and purple-red shown in theupper row are the same red, and theyellowish-green and bluish greendisplayed in the lower row are the samegreen.

Saturationcontrast

When a small patch is surrounded by afield that is of the same color but ofstronger saturation, the patch appears tobe tinted less vivid (less saturated). On theother hand, when a small patch issurrounded by a field that is of the samecolor but of weaker saturation, the patchappears to be tinted more vivid (moresaturated). In this image, the right smallpatch appears to be more vivid than theleft one, though they are the same in colorand saturation.

Munker illusion

(Munker, 1970)

The orange and purple-red shown in theupper row are the same red, and theyellowish-green and bluish greendisplayed in the lower row are the samegreen. The Munker illusion is thechromatic White effect.

http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6191http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6194http://www.psy.ritsumei.ac.jp/~akitaoka/Munkere.html



McCollougheffect

(McCollough,1965)

After alternately viewing a vertical stripeof black and magenta and a horizontalone of black and green, observers seeillusory green in a vertical stripe of blackand white and illusory magenta in ahorizontal one of black and white.

Colorconstancy

new!

The right eye appears to be bluish whilethe left eye appears to be gray, thoughboth are physically gray.

< Visual completion >

Neon colorspreading

(Varin, 1971;Van Tuijl,

1975)

When crossing points of a black gratingin front of a white background arereplaced with color crosses, the colorappears to go out into the background.

http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6167http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6114http://www.psy.ritsumei.ac.jp/~akitaoka/eyecolorconstancycyanLs.jpghttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6483http://www.psy.ritsumei.ac.jp/~akitaoka/neoncolorspreading02.jpghttp://www.psy.ritsumei.ac.jp/~akitaoka/notes.html#neonhttp://www.psy.ritsumei.ac.jp/~akitaoka/notes.html#neonhttp://www.psy.ritsumei.ac.jp/~akitaoka/neonref.htmlhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6023



Kanizsatriangle

Kanizsa (1976,1980)

An illusory triangle appears to be in frontof three black circles and a line-drawingtriangle, though there are not completecircles or a complete line-drawingtriangle.

Kanizsa, G. (1980) Grammatica del

vedere. Saggi su percezione e

gestalt. Bologna: Società editrice il

Mulino.

Watercolorillusion

In this image, the corridor part of thesquare appears to be tinted green though itis white (Pinna, Brelstaff and Spillmann,2001; Pinna, Werner and Spillmann,2003).

Samples of watercolor illusion

Wave-linecolor illusion

The white background appears to be tintedorange behind orange waves.

Sohmiya, S. (2007) A wave-line colourillusion. Perception, 36, 1396-1398.

Visualphantoms(stationaryphantoms)

When a dark-to-light luminance grating isoccluded by a dark occluder, the darkregions of the grating appear to cross infront of the occluder.

Gyoba, J. (1983) Stationaryphantoms: A completion effectwithout motion and flicker. VisionResearch, 23, 205-211.

Kitaoka, A., Gyoba, J., and Sakurai, K.(2006) Chapter 13 The visual phantomillusion: a perceptual product of surfacecompletion depending on brightness and

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contrast. Progress in Brain Research, 154(Visual Perception Part 1), 247-262.

PubMedPBR PDF Reprint request to me

Visualphantoms

('light'stationaryphantoms)

When a dark-to-light luminance grating isoccluded by a bright (light) occluder, thebright (light) regions of the grating appearto cross in front of the occluder.

Sakurai, K. and Gyoba, J. (1985)Optimal occluder luminance forseeing stationary visual phantoms.Vision Research, 25, 1735-1740.

< Illusion of visual motion >

Copyright Akiyoshi Kitaoka 2008 (April 29)

Apparentmovement

Objects appear to shift between twostationary images when presentedsuccessively.

After watching a moving pattern for awhile (adaptation) and switching the gazeto a stationary image, the observer seesthe visual field where he/she keptwatching the motion move in the oppositedirection. References

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=17010715&query_hl=5&itool=pubmed_docsumhttp://www.elsevier.com/wps/find/bookseriesdescription.cws_home/BS_PBR/descriptionhttp://www.psy.ritsumei.ac.jp/~akitaoka/phantom2006PBR.pdfmailto:[email protected]?Subject=PDF%20request%20for%20illusion%20paperhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6179http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6180http://www.psy.ritsumei.ac.jp/~akitaoka/amovement.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/amovement.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/amovement.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/MAEref.txt



Motionaftereffect

An adaptation stimulus to visual motion isavailable in Visiome.

Rubber pencilillusion

A pencil appears to bend when wiggled.

Pomerantz, J. R. (1983) The rubber pencilillusion. Perception & Psychophysics, 33,365-368.

Ouchi illusion

(Ouchi, 1977;Spillmann et al

1986)

The inset appears to move.

Fraser-Wilcoxillusion

(Fraser andWilcox, 1979)

Disks appear to rotate spontaneously.Many people see counterclockwiserotation in the left disk and clockwiserotation in the right disk; some people seethe reversal. This individual difference ishereditary.

OptimizedFraser-Wilcoxillusion

(Kitaoka andAshida, 2003)

(This illusionmight possiblybe differentfrom the blink-dependentillusion inFaubert andHerbert'speripheral driftillusion)

Stationary objects appear to move"spontaneously". The direction of motionis black » dark-gray » white » light-gray »black.

http://www.psy.ritsumei.ac.jp/~akitaoka/aspiralMAE01.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/aspiralMAE01.htmlhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6181http://www.psy.ritsumei.ac.jp/~akitaoka/rubberpencilillusion01.gifhttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=5975http://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6166http://www.psy.ritsumei.ac.jp/~akitaoka/Fraser-Wilcoxillusion3.jpghttp://www.psy.ritsumei.ac.jp/~akitaoka/page_thumb7.html



OptimizedFraser-Wilcoxillusion, Type I

(Ashida andKitaoka, 2003;Backus andOruç, 2005;Kitaoka, 2006)

Stationary objects appear to move"spontaneously". The direction of motionis black » dark-gray, and white » light-gray.

OptimizedFraser-Wilcoxillusion, TypeIIa

(Kitaoka, 2006)

Stationary objects appear to move"spontaneously". The direction of motionis black » dark-gray » white » light-gray »black.

I think that "Rotating snakes" depends onthis illusion.

The flutteringheart

A red heart on the blue backgroundappears to move in visual periphery inmesopic vision.

< Others >

Moon illusion

The horizon moon appears to be largerthan the elevated moon.

References

Chromaticnegative

afterimage

Fix your eyes on either of the fixationpoints (crosses) for several seconds.Then, move your eyes to the other fixationpoint, and chromatic negative afterimagesappear.

A schematic

explanation

of depth-

reversal

http://www.psy.ritsumei.ac.jp/~akitaoka/page_thumb85.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/page_thumb86.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/fhearte.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/fhearte.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/fhearte.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/moonillusionKokusaikaikans.jpghttp://www.psy.ritsumei.ac.jp/~akitaoka/moonillusion.txthttp://www.psy.ritsumei.ac.jp/~akitaoka/colorafterimage.jpg



silhouette

figures,

including the

silhouette

illusion

(Kayahara,

2003)

Reversiblefigure ofapparent

movement

The ring appears to rotate clockwise orcounterclockwise. The direction ischangeable.

An illusion

design to

advertise

Visiome

(This is not

the formal

design of

Visiome)

Visiome Platform is a digital research

resource archive for vision science.

The available resources include

mathematical models, experimental

stimuli, experimental data, and

analytical tools. Visiome

Copyright Akiyoshi Kitaoka 2008 (April 26; July 31)

An illusion

design to

advertise

Visiome

(This is not

the formal

design of

Visiome)



2008>will be available.

"Rotatingsnakes"

(illusion work)

Each disk appears to rotate spontaneously.

(9900 x 7425, 33MB)

Girl of blue eyes 3 2 1

Classification of anomalous motion illusions(August 30, 2004)

Comprehensive classification of illusions(February 15, 2005)

A catalogue of visual illusion, MS-Word version(February 20, 2005)

Classification of color illusion(May 30, 2005)

Thanks to Walter

Akiyoshi's illusion pages

http://www.psy.ritsumei.ac.jp/~akitaoka/rotsnakesstrong6b1.jpghttp://www.psy.ritsumei.ac.jp/~akitaoka/rotsnakesstrong6b1.jpghttp://www.psy.ritsumei.ac.jp/~akitaoka/rotsnakesstrong6b1.jpghttp://platform.visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6291http://www.psy.ritsumei.ac.jp/~akitaoka/blueeyegirl3e.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/blueeyegirl2e.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/blueeyegirle.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/classify.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/classificatione.htmlhttp://www.psy.ritsumei.ac.jp/~akitaoka/VisualIllusions.dochttp://www.psy.ritsumei.ac.jp/~akitaoka/shikisai2005.htmlhttp://www.ritsumei.ac.jp/~akitaoka/index-e.htmlhttp://www.ritsumei.ac.jp/~akitaoka/index-e.htmlhttp://www.ritsumei.ac.jp/~akitaoka/index-e.html

www.psy.ritsumei.ac.jpCatalogue of illusions

< geometrical illusion (illusion of shape) >robvdw/practicum_illusions/demos...a catalogue of...

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