Impossible figures 2

since August 12, 2009

"Impossible wave with cats"

Copyright Akiyoshi Kitaoka 2011 (July 4)

This idea was suggested by Jasmina Stevanov.

Schuster's clevis

Drawn by Akiyoshi Kitaoka 2011 (July 4)

Schuster, D. H. (1964) A new ambiguous figure: A three-stick clevis. American Journal of Psychology, 77, 673.

This is called 'devil's fork', too. There remains a possiblity that Oscar Reutersvärd was the first to draw this type of impossible figure. <July 4, 2011>

According to Kanizsa (1980), Penrose (1958) showed this image. <July 7, 2011>

I confirmed that Penrose and Penrose (1958) did not show this impposible figure. There were four figures. Fig.1 showed the Penrose triangle. Fig.2 was a doubled and connected Penrose triangles. Fig.3 showed the infinite staircase. Finally, Fig. 4 was a photo of a model of the infinite staircase. They cited Escher's (1954) catalog published in Amsterdam. <July 8, 2011>

Penrose, L. S. and Penrose, R. (1958). Impossible objects: A special type of visual illusion. British Journal of Psychology, 49, 31-33.

"Impossible cubes"

Copyright Akiyoshi Kitaoka 2010 (November 16)

"Impossible square"

Copyright Akiyoshi Kitaoka 2010 (November 16)

"Amodal completion-dependent impossible figure with the Shepard illusion"

The two red parallelograms are of the same size and shape, but the upper one appears to be slimmer than the lower one.

Copyright Akiyoshi Kitaoka 2010 (July 11)

Sugihara sensei's page

"Fractal Penrose triangles"

Copyright Akiyoshi Kitaoka 2010 (June 2)

"Impossible columns"

Figure and ground are inconsistent.

Copyright Akiyoshi Kitaoka 2009 (August 12)

Copyright Akiyoshi .Kitaoka 2006 (July 1)


Penrose's triangle

This impossible figure seems to have first been proposed by 'The Father of impossible figures' Oscar Reutersvärd. <July 4, 2011>

The basis of Penrose's triangle

Impossible figures 1

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