Illusion of shifted gradations
since March 3, 2005
Basic patterns
(copyright free)
The horizontal gray line appears to tilt counterclockwise (Kitaoka, 1998; Kitaoka, Pinna and Brelstaff, 2004).
References
Kitaoka, A. (1998). Apparent contraction of edge angles. Perception, 27, 1209-1219.
Kitaoka, A., Pinna, B., and Brelstaff, G. (2004). Contrast polarities determine the direction of Cafe Wall tilts. Perception, 33, 11-20.
Horizontal gray lines appear to tilt alternately.
p.1216, Figure 16(a) in Kitaoka, A. (1998). Apparent contraction of edge angles. Perception, 27, 1209-1219.
Horizontal gray lines appear to tilt alternately.
p.1216, Figure 16(b) in Kitaoka, A. (1998). Apparent contraction of edge angles. Perception, 27, 1209-1219.
Vertical or horizontal gray lines appear to bend.
p.1217, Figure 19 in Kitaoka, A. (1998). Apparent contraction of edge angles. Perception, 27, 1209-1219.
"Sakura-yu"*
*Cherry tea for some celebration
Vertical or horizontal pinky lines appear to wave.
Copyright A.Kitaoka 1999
"Hurricane"
The concentric gray lines appear to be spirals.
Kitaoka, A., Pinna, B., and Brelstaff, G. (2001). Last but not least: New variations of spiral illusions. Perception, 30, 637-646. (p. 638, Figure 2a)
Copyright Akiyoshi Kitaoka 2001, reproduced March 31, 2013