Classic geometrical illusion 4

since June 13, 2006


"Radio waves"

Horizontal line segments that are aligned horizontally appear to tilt.

Copyright Akiyoshi Kitaoka 2006 (July 10)


"Hidden geometrical illusion"

The upper trapezoid appears to be larger than the lower counterpart though they are of the same size (Jastrow's trapezoid illusion or pop-cup illusion). This illusion tends to be ignored by giving much attention to the demonstration of the effect of shadow on the perceived spatial position of an object, in which the ball in the upper image appears to float off the surface of the ground.

Copyright Akiyoshi Kitaoka 2006 (June 29)


"Rotation of eyes"

The tips of arrows are aligned vertically in each circle, but the left alignment appears to tilt clockwise while the right one counterclockwise (Müller-Lyer illusion). This effect is enhanced by the anomalous motion illusion that appears at the tips.

Copyright Akiyoshi Kitaoka 2006 (June 27)

Jasmina has registered this image in Visiome. <January 18, 2013>
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"Decelerated Müller-Lyer illusion"

The distance between the left and right tips of arrows is identical between the upper figure and the lower one, but appears to be longer in the latter than in the former (Müller-Lyer illusion). This image seems to include an unknown anomalous motion illusion, which appears to expand the distance in the upper figure and appears to contract that in the lower figure.

Copyright Akiyoshi Kitaoka 2006 (June 27)


"Accelerated Poggendorff illusion"

The lower-left oblique line is aligned with the upper-right one, but the former appears to be located leftward (Poggendorff illusion). This image includes an anomalous motion illusion, in which the lower-left oblique line appears to move leftward while the upper-right one rightward.

Copyright Akiyoshi Kitaoka 2006 (June 24)


"Moving Brentano version of the Müller-Lyer illusion"

The distance between the tips of arrows is identical between the left side and right one, but appears to be longer in the former than in the latter (Müller-Lyer illusion, the Brentano version). This image includes an unknown anomalous motion illusion, in which the middle arrow appears to move rightward.

Copyright Akiyoshi Kitaoka 2006 (June 24)


"Accelerated Müller-Lyer illusion"

The distance between the left and right tips of arrows is identical between the upper figure and the lower one, but appears to be longer in the latter than in the former (Müller-Lyer illusion). This image includes an unknown anomalous motion illusion, which appears to expand the distance in the lower figure and appears to contract that in the upper figure.

Copyright Akiyoshi Kitaoka 2006 (June 22)


"Rotating double-square turtles"

Purple or yellow elements in each double-square are aligned along squares, but the alignment appears to be distorted by the illusion of fringed edges (Kitaoka et al., 2004). In addition, the double-squares appear to move.

Copyright Akiyoshi Kitaoka 2006 (June 19)

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


"Baby turtles lightened by the moon"

Each border of adjacent turtles is vertical or horizontal, but appears to be tilted by the illusion of fringed edges (Kitaoka et al., 2004). In addition, the turtles appear to wave.

Copyright Akiyoshi Kitaoka 2006 (June 17)

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


"Rotating double-square snakes"

Blue or yellow elements in each double-square are aligned along squares, but the alignment appears to be distorted by the illusion of shifted edges (Kitaoka et al., 2004). In addition, the double-squares appear to move.

Copyright Akiyoshi Kitaoka 2006 (June 13)

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


Classic geometrical illusion 3

Classic geometrical illusion 2

Classic geometrical illusion 1


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