Tag: Geometrical illusions
179-parallel lines dis
File Size: 30Kb
Resolution: 500x500
Even though they seem to bulge inwards, the lines are perfectly straight and parallel t...
261-blue lines twist col
File Size: 78Kb
Resolution: 436x500
Do the blue lines twist up and down like a water flow? This illusion is mainly due to l...
63-moving lumachine mov
File Size: 59Kb
Resolution: 357x500
You may see flashing horizontal flows... The illusion of flows occurs when we look at c...
78-how many triangles2
File Size: 37Kb
Resolution: 473x500
Can you perceive 6 triangles in this Kanisza-like figure? (Illusory figures.)
Acswamp1
File Size: 357Kb
Resolution: 550x545
The vertical and horizontal lines appear to tilt in this image
Acswamp2
File Size: 231Kb
Resolution: 413x408
In Akiyoshi Kitaoka's 'Waves', horzontal and vertical lines appear to tilt
Acswamp3
File Size: 347Kb
Resolution: 547x540
In this illusion, horizontal and vertical lines appear to tilt
Acswamp5
File Size: 581Kb
Resolution: 750x748
In Akiyoshi Kitaoka's 'Swirls', concentric circles appear to spiral
Ajisai
File Size: 15Kb
Resolution: 419x420
In Akiyoshi Kitaoka's 'Hydrangea', vertical and horizontal edges appear distorted
Akacho0
File Size: 9Kb
Resolution: 353x353
The oblique lines in this image are actually straight but appear to curve
Babaroa
File Size: 8Kb
Resolution: 427x426
In Akiyoshi Kitaoka's 'Barbaroa' horizontal and vertical edges appear distorted
Bachshepardmonster
File Size: 267Kb
Resolution: 570x570
Move your mouse pointer over the image. A second 'monster' appears at the bottom. Compa...
Bachshepardtables
File Size: 63Kb
Resolution: 570x570
Compare the two tables in the neighbouring figure. How do size and shape of the two tab...
Bashful
File Size: 46Kb
Resolution: 570x570
In Akiyoshi Kitaoka's 'Bashful', horizontal and vertical lines appear to tilt
Beuchet Chair Video
File Size: 18Kb
Resolution: 256x144
This short video shows how the chair is laid out. Thanks to Frans Verstraten for the v...
Brelstaff-percep30-p637
File Size: 159Kb
Resolution: 570x570
(a) The spiral illusion of the Café Wall illusion, in which grey concentric circles ap...
Bristol cafe wall
File Size: 6Kb
Resolution: 279x218
The real life origin of the cafe wall illusion from a cafe in Bristol. The lines appear...
Bulge
File Size: 5Kb
Resolution: 270x270
This is a variant of the Hering illusion, from Akiyoshi Kitaoka. Click on Web Link and ...
Cafe wall
File Size: 7Kb
Resolution: 640x375
The cafe wall illusion, so called because the first time this illusion was spotted was ...
Cafekihon percep 33 fig2
File Size: 57Kb
Resolution: 570x570
Four variations of the Cafe Wall illusion: A, the standard Cafe Wall illusion; B, the c...
Cafewal1
File Size: 0Kb
Resolution: 315x101
This illusion is related to the cafe wall illusion. The middle grey line appears to sl...
Cafewall
File Size: 53Kb
Resolution: 570x570
The tiles are moving left and right in alternating rows. In the 'half-shifted condition...
Circle
File Size: 41Kb
Resolution: 1137x820
Discontinuous circle illusion: for more details, see Extra Information.
Circles
File Size: 5Kb
Resolution: 403x397
The small circles in this picture appear to differ in size, but all are identical
Closure
File Size: 1Kb
Resolution: 300x287
The 'Kanizsa figure' is a closure illusion based on subjective or illusory contours. Th...
Coffernorcia
File Size: 88Kb
Resolution: 862x962
Coffer Illusion (variation on Gianni Sarcone’s “Op Art illusion”) - First time viewers ...
Cspiral01
File Size: 174Kb
Resolution: 500x500
In Akiyoshi Kitaoka's colourful 'Ripple' can you see illusory depth, or no illusion at ...
Diamond
File Size: 99Kb
Resolution: 349x256
Is the central diamond composed of straight or curved lines? Click on Web Link and drag...
Diamondillusion2
File Size: 3Kb
Resolution: 262x178
Cognitive contours: our brain clearly sees a diamond, although only straight vertical a...
Ebbinghaus
File Size: 159Kb
Resolution: 570x570
In the 'Ebbinghaus Illusion' or 'Titchener Circles' the central circles are the same size
Eisochi
File Size: 14Kb
Resolution: 425x426
In this illusion, the vertical and horizontal edges appear to tilt
Faceface
File Size: 16Kb
Resolution: 415x408
In Akiyoshi Kitaoka's 'Face-to-Face', vertical and horizontal edges appear to be distorted
Fish
File Size: 4Kb
Resolution: 532x319
Akiyoshi Kitaoka's 'Fish' is a version of the cafe wall illusion. Grey lines appear to...
Fraser
File Size: 252Kb
Resolution: 570x570
This picture depicts 'Fraser's Spiral'. But if you place the mouse over it, it becomes...
Frasermovie1 from michael morgan
File Size: 100Kb
Resolution: 570x570
A dynamic version of the Fraser Twisted cord. The lines appear to converge but are act...
Frasermovie2
File Size: 96Kb
Resolution: 570x570
A dynamic version of the Fraser Twisted cord. The lines appear to converge but are act...
Gakugaku
File Size: 5Kb
Resolution: 291x292
In this illusion, the blue squares appear to be misaligned at the borders between red a...
Giovanelli illusion
File Size: 18Kb
Resolution: 653x106
The Giovanelli Illusion. The smaller circles are on a straight line although they do no...
Graynecker
File Size: 230Kb
Resolution: 710x500
A Necker cube invisible to all known cortical mechanisms
Hatsuden
File Size: 102Kb
Resolution: 307x304
In this illusion, the underlying faint diamond grid consists of straight lines, but the...
He and ooi illusory0lfinal
File Size: 375Kb
Resolution: 1520x972
The Illusory-O illusion. Click on 'additional information' for more details.
Hering
File Size: 2Kb
Resolution: 282x171
The Hering illusion. Both horizontal lines are straight and parallel, they seem bent be...
Hering all
File Size: 1Kb
Resolution: 157x118
Geometrical distortions: The Herring illusion. The parallel lines appear to bend, but ...
Hinaara
File Size: 3Kb
Resolution: 225x225
In Akiyoshi Kitaoka's 'Hina-arare', straight lines appear to be curves
Iconillu
File Size: 13Kb
Resolution: 362x375
Ishihara's Icon Illusion: the icons in this image appear to tilt downwards towards the ...
Ill 3 cubes
File Size: 2Kb
Resolution: 190x190
Is this a room with a box in it or a big cube with a smaller cube in front of it?
Ill bended circle
File Size: 13Kb
Resolution: 250x257
The 'Orbison Illusion' seems to contain a small bent circle, which is actually perfectl...
Illusoryo gaps
File Size: 94Kb
Resolution: 570x570
The impact of spatial proximity on the Illusory-O figure. As the gap between the inner ...
Incline
File Size: 83Kb
Resolution: 500x500
These circles are arranged horizontally but appear to tilt downwards to the right
Jastrowi
File Size: 0Kb
Resolution: 97x91
The Jastrow Illusion: the two figures are the same size but the inner one appears to be...
Judd1
File Size: 62Kb
Resolution: 570x570
The Judd Illusion: the right hand side of the horizontal line looks longer than the lef...
Kabuki
File Size: 8Kb
Resolution: 339x339
In Akiyoshi Kitaoka's 'Kabuki' the straight lines appear to wave
Kaeru
File Size: 5Kb
Resolution: 361x362
In Akiyoshi Kitaoka's 'Frogs', vertical and horizontal lines appear distorted
Kaiso
File Size: 15Kb
Resolution: 498x385
In Akiyoshi Kitaoka's 'Seaweed', the shapes are aligned vertically in a straight line b...
Kaki
File Size: 13Kb
Resolution: 307x305
In this image vertical or horizontal edges appear distorted
Kakigori
File Size: 10Kb
Resolution: 413x414
In this image vertical and horizontal edges appear distorted
Kameyosh
File Size: 4Kb
Resolution: 323x324
In this image the vertical and horizontal lines appear to wave
Kamiare
File Size: 51Kb
Resolution: 545x523
In Akiyoshi Kitaoka's 'Thunder and Lightning', illusory lines are perceived between dot...
Kanizsa-rose-with-faces
File Size: 201Kb
Resolution: 2217x2067
The illusion is from a personal communication that Dave Rose received from Kanizsa, c. ...
Kc
File Size: 161Kb
Resolution: 570x570
An interactive variation of the Kanisza triangle. The cutout circles give rise to an il...
Kniza squares
File Size: 38Kb
Resolution: 570x570
Illusory contours. This display shows the effects of background modulation on illusory ...
Koinobo
File Size: 8Kb
Resolution: 363x365
The oblique lines in this image are straight. but appear to be curved
Koinobo0
File Size: 3Kb
Resolution: 371x382
The horizontal edges in Akiyoshi Kitaoka's 'Koinobori' appear to tilt
Koumori
File Size: 5Kb
Resolution: 301x301
In Akiyoshi Kitaoka's 'House of Bats', the vertical and horizontal straight lines appea...
Kurodia
File Size: 7Kb
Resolution: 363x362
In this version of the cafe wall illusion, horizontal and vertical grey lines appear to...
Lines
File Size: 1Kb
Resolution: 212x219
In 'The Sander Illusion', the red and green lines are the same length
Majantak
File Size: 11Kb
Resolution: 421x421
This figure consists of squares, but appears to be wavy
Makkuro
File Size: 4Kb
Resolution: 225x225
In this illusion, the background is a checkerboard made up of squares but the figure ap...
Mli
File Size: 17Kb
Resolution: 664x570
Akiyoshi Kitaoka's version of the Muller Lyer illusion. The two horizontal bars are th...
Monster
File Size: 95Kb
Resolution: 256x343
These two monsters are exactly the same size. Click on Web Link and drag the cursor ove...
Muelue
File Size: 35Kb
Resolution: 570x570
An interactive bisection accuracy task with the Muller-Lyer illusion.
Muller lyer
File Size: 39Kb
Resolution: 570x570
In this Muller - Lyer illusion both lines are the same length. The apparent discrepency...
Muller lyer tickets
File Size: 37Kb
Resolution: 563x292
In this mix of the Muller - Lyer and the Poggendorf illusions, the red lines are the sa...
Mullerlyer1
File Size: 25Kb
Resolution: 570x570
The Muller-Lyer Illusion: the horizontal line in the bottom figure often appears longer...
Musifun2
File Size: 5Kb
Resolution: 323x321
This figure consists of straight lines, yet appears to be curvey and wavy
Mutually Interfering Shapes Illusion (MISillusion)
File Size: 155Kb
Resolution: 1000x727
The observer should fixate at the black dot in the center and attend to the paths of th...
Necker cube
File Size: 69Kb
Resolution: 570x570
Does 'The Necker Cube' have a green side on the front or on the back? This was first fo...
Oil riddle
File Size: 72Kb
Resolution: 570x570
The oil riddle. It's war... You were sent out to destroy oil tanks, but you only have o...
Oppel-kundt illusion
File Size: 12Kb
Resolution: 572x572
An illusion of filled extent, first described by oppel in 1855. The line B lies equidi...
Oppelkui
File Size: 8Kb
Resolution: 570x570
The Oppel-Kundt Illusion: the centre of this figure is the second line from the right, ...
P carre dis0
File Size: 1Kb
Resolution: 138x147
A geometrical distortion - the square in the centre does not look square! The sides ap...
P dist corners
File Size: 25Kb
Resolution: 570x570
Geometrical distortions: the circles do not look completely circular
P dist losange
File Size: 13Kb
Resolution: 570x570
Geometrical distortions: The left-hand circle looks bigger than the right-hand circle, ...
P dist radiation
File Size: 4Kb
Resolution: 143x147
Geometrical distortions: the smaller circle does not look completely circular
P dist rond carre
File Size: 2Kb
Resolution: 162x166
Geometrical distortions: the circle looks distorted, the square does not
P dist zolner
File Size: 20Kb
Resolution: 570x570
Geometrical distortions: the Zollner Illusion. The two horizontal lines do not look pa...
Papathomas-percep31-p1450-f
File Size: 6Kb
Resolution: 513x541
The classic version (top panel) and a gradient version (bottom panel) of brightness ind...
Pavlova percep29 p1207
File Size: 18Kb
Resolution: 570x570
This is the Delboeuf illusion. Here the outer dashed circle in (b) usually appears sma...
Phillips-ebbinghaus-percep-
File Size: 29Kb
Resolution: 568x568
Ebbinghaus illusion: in both the upper and lower sets of circles, the centre circle on ...
Poggaustralia
File Size: 15Kb
Resolution: 577x568
The Poggendorff Illusion: the lines coming from either side of Australia do not appear ...
Poggendorff
File Size: 16Kb
Resolution: 620x568
The poggendorf illusion. The rectangle actually covers one straight line
Poggendorff-acute21
File Size: 19Kb
Resolution: 812x754
The Poggendorff Illusion: proof that the two ends are aligned
Poggendorff-obtuse2
File Size: 14Kb
Resolution: 566x569
The Poggendorff Illusion: proof that the two ends are aligned
Poggendorff-yellow
File Size: 112Kb
Resolution: 570x570
An interactive version of the Poggendorff illusion. The width of the occluding rectangl...
Poggendorff1
File Size: 14Kb
Resolution: 566x561
The Poggendorff Illusion: the two diagonal lines do not look as if they could meet up. ...
Poggenta
File Size: 281Kb
Resolution: 640x480
A real-life version of the Poggendorff Illusion: the crossed brown bars do not appear t...
Poggo horrell
File Size: 38Kb
Resolution: 570x570
A version of the Poggendorff illusion due to Horrell, showing that the illusion disappe...
Ponzo
File Size: 7Kb
Resolution: 261x224
In the Ponzo Illusion, the two horizontal lines have the same length despite the upper ...
Ponzo wall all
File Size: 6Kb
Resolution: 206x122
The Ponzo Wall illusion: the two human figures are actually the same size, although the...
Ponzo1
File Size: 20Kb
Resolution: 473x634
The Ponzo Illusion: most viewers perceive the uppermost horizontal line to be longer th...
Ponzo2
File Size: 21Kb
Resolution: 473x634
The Ponzo Illusion? Most viewers find that the illusion does not work when the middle l...
Pressure
File Size: 34Kb
Resolution: 305x302
In this illusion, horizontal and vertical grey lines appear to be distorted
Ringotsu
File Size: 5Kb
Resolution: 297x296
In this illusion, vertical edges appear to tilt in alternate directions
Robinson-bjp64-2a
File Size: 594Kb
Resolution: 1764x2528
The impossible colonnade and other variations of a well-known figure.
Rotating circles1
File Size: 422Kb
Resolution: 570x570
The circles appear to rotate. A version of the Uzumaki or 'rabbit ears' illusion.
Rspiral1
File Size: 161Kb
Resolution: 2000x2000
In this illusion, red appears to be orange or magenta (purple) due to colour contrast e...
Ryu2000
File Size: 26Kb
Resolution: 521x521
In Akiyoshi Kitaoka's 'Dragon Ascending', straight vertical and straight horizontal gre...
Ryuuroko
File Size: 26Kb
Resolution: 393x394
In Akiyoshi Kitaoka's 'Scales of a Dragon', vertical and horizontal edges appear to tilt
Sagano1
File Size: 7Kb
Resolution: 330x410
Akiyoshi Kitaoka's 'Bamboos of Sagano' combines two illusions: the 'light' green and 'd...
Sarcone cube moving
File Size: 61Kb
Resolution: 100x100
The 'Moving Cube' switches between a cube with a small cube cut out and a cube with a s...
Sarcone's ellipses
File Size: 962Kb
Resolution: 2717x2717
This is an optical illusion of relative size perception. By effect of assimilation, th...
Schroder stairs
File Size: 3Kb
Resolution: 245x241
The 'Schroder stairs' either show a glass sphere in the foreground or the background
Seidan
File Size: 30Kb
Resolution: 529x529
This grid is made up of straight parallel lines, but appears to be made of wavy ones
Shepard subterranea
File Size: 21Kb
Resolution: 349x460
In this illusion entitled 'Terra Subterranea', both the bully and his victim are the sa...
Shiosai
File Size: 5Kb
Resolution: 394x392
In this modulation of the Koffka Ring there appears to be four colours in this image, a...
Shugen
File Size: 6Kb
Resolution: 327x330
The small squares in this figure run in straight lines, although they appear to wave
Shukko
File Size: 8Kb
Resolution: 349x336
In Akiyoshi Kitaoka's 'Tapes', the coloured lines in the background appear to bend and ...
Silhouet2
File Size: 4Kb
Resolution: 278x172
'Silhouette' shows the difference one line makes to the perceived direction of a silhou...
Size-contrast illusion with coins
File Size: 54Kb
Resolution: 960x720
The size-contrast (Titchner/Ebbinghaus) illusion is a powerful illusion of both size an...
Skjastro
File Size: 263Kb
Resolution: 513x492
The Jastrow Illusion in Shijo Karasuma. The lower arc appears to be larger than the up...
Soldiers
File Size: 41Kb
Resolution: 578x573
In this version of the Ponzo illusion all soldiers are the same size
Sowden and watts jittered squares2
File Size: 58Kb
Resolution: 576x584
The Jittered Squares Illusion. All of the squares in this image are aligned with the ho...
Spiral from chris tyler
File Size: 44Kb
Resolution: 464x350
Dynamic tri-spoked spiral. When staring at this illusion swirling patterns are seen
Spiral radialspokes
File Size: 149Kb
Resolution: 503x503
A variation of Hermann's grid. The illusory spots line up with the black spaces to crea...
Square
File Size: 12Kb
Resolution: 310x310
In the 'Ehrenstein Illusion', the square is a perfect square
Sun1c
File Size: 351Kb
Resolution: 545x543
Although the checked pattern consists of vertical and horizontal components, the figure...
Suzupock
File Size: 2Kb
Resolution: 352x356
The two half-circles in this image appear to differ in shape and size, but are actually...
Swirls
File Size: 55Kb
Resolution: 934x500
In this illusion, the left swirl appears to contract whilst the right swirl appears to ...
Table
File Size: 54Kb
Resolution: 570x570
These two tables are exactly the same size. Click on Web Link and drag the cursor over ...
Taiyo
File Size: 219Kb
Resolution: 495x498
In this illusion, the radial lines appear to bend and wave
Takobeya
File Size: 24Kb
Resolution: 477x478
In this illusion, vertical or horizontal lines appear distorted
The schmidt
File Size: 34Kb
Resolution: 339x512
Which of the chinese is the tallest in this swiss advertising card called 'Schmidt Tea'...
Titchener all
File Size: 69Kb
Resolution: 570x570
Titchener circles: the two central circles are actually the same size, but the left-han...
Tobira
File Size: 2Kb
Resolution: 229x230
In Akiyoshi Kitaoka's 'Doors', the white rectangles appear to be distorted
Toramoyo
File Size: 196Kb
Resolution: 387x384
In Akiyoshi Kitaoka's 'Tiger', the thick black oblique lines do not appear to be straig...
Trunks
File Size: 2Kb
Resolution: 467x169
In Akiyoshi Kitaoka's 'Trunks', horizontal line segments appear to tilt
Ultrapica
File Size: 15Kb
Resolution: 551x548
In this illusion, the vertical and horizontal edges appear to tilt
Uzu
File Size: 48Kb
Resolution: 458x455
In Akiyoshi Kitaoka's 'Rabbits', concentric spirals appear to be a spiral
V muller
File Size: 0Kb
Resolution: 202x175
The Muller-Lyer illusion: the two horizontal lines are exactly the same length, but do ...
V ponzo
File Size: 48Kb
Resolution: 570x570
The Ponzo illusion: one of the vertical lines looks smaller than the other, but both ar...
V zolner
File Size: 1Kb
Resolution: 202x175
The Zollner illusion: the diagnonal lines are actually parallel, although they do not a...
Wundt all
File Size: 4Kb
Resolution: 177x101
The Wundt illusion: the two horizontal lines do not appear to be straight and parallel.
Wunfici
File Size: 35Kb
Resolution: 570x570
The Wundt-Fick Illusion: the horizontal lines looks shorter than the vertical line, yet...
Ynglass
File Size: 1Kb
Resolution: 297x244
Akiyoshi Kataoka's version of the Muller-Lyer illusion. The left Y-junctions appear to...
Zenshin2
File Size: 35Kb
Resolution: 512x512
In this illusion, the rings appear to rotate when fixating on the centre and moving tow...
Zollner
File Size: 13Kb
Resolution: 235x235
In the Zollner illusion, these long lines are really parallel
Zollner1
File Size: 149Kb
Resolution: 570x570
The Zollner Illusion: the horizontal lines are actually parallel, but appear to converg...
Zollneraki
File Size: 80Kb
Resolution: 570x570
The Zollner Illusion: the horizontal lines are parallel but appear to converge and diverge