Ambiguous or reversible figures
since May 12, 2004; access since February 15, 2005
In this silhouette, the person appears to either raise her right leg or left leg.
In this image, the person appears to raise her right leg.
In this image, the person appears to raise her left leg.
"Pictorial explanation of the Silhouette illusion"
See the images.
Copyright Akiyoshi Kitaoka 2007 (December 23)
According to Elie,
The girl could be imagined in another stance still facing the end user with her left foot trying to shoot or catch the ball,, same if shefs not facing us though it would be more difficult.
<February 18, 2012>
Moving reversible figure (lady's figure appears to rotate clockwise or counterclockwise) created by Nobuyuki Kayahara, Hiroshima, Japan
(c) Nobuyuki Kayahara 2003
A further study
"Forced reversal of reversible images"
It does not appear to be funny though the orientations of images are suddenly changed.
Copyright Akiyoshi Kitaoka 2007 (December 24)
"Octopus and asteroid"
A set of eight spirals or a set of five spirals appears to be observed. For each spiral of the former, the number increases eight by eight when the spiral moves toward the center. For each spiral of the latter, the number increases five by five when the spiral moves toward the center.
Copyright Akiyoshi Kitaoka 2007 (November 21)
Spirals according to the golden angle
"Crows and kakashi"*
*kakashi = scarecrows
Either crows or kakashi are observed.
Copyright Akiyoshi Kitaoka 2007 (October 1)
"The full moon or the evening sun"
The full moon and the evening sun appear to change to each other.
Copyright Akiyoshi Kitaoka 2007 (August 21)
The apparent orientation of a mailbox is changed facing either of the following four directions: top-right, top-left, bottom-right and bottom-left.
Copyright Akiyoshi Kitaoka 2007 (April 21)
In addition, the image appears to expand laterally.
The lower-left group appears to be a checkerboard of yellow and red squares superimposed by oblique streaks of blue "mist", while the upper-right group appears to be a checkerboard of yellow and blue squares superimposed by oblique streaks of red "mist".
Copyright Akiyoshi Kitaoka 2006 (March 9)
Two ways of perception alternate (cubes seen from outside versus cubes seen from inside). Each appearance may also look impossible, but actually both are possible with the help of perceptual transparency.
Copyright A.Kitaoka 2004 (May 12)
*a kind of Japanese cake
It looks like yokans by fusing the figure. This is a kind of Necker cube with transparency and binocular stereopsis.
Copyright A.Kitaoka 1997