Subjective Contours | Foreground - Background
When you look at the picture, do you see a white triangle floating in front of the black circles? Most people do, although there is not one there! The way the circle parts are cut out, makes us think a triangle is there!
Download also high-resolution TIFF versions of this illusion:
Here, we have a similar phenomenon with a white circle floating above converging lines. Again, the way the lines are cut out, makes us think a circle is there!
For an explanation of the foreground-background phenomenon, see Perceptual Organization - Figure and Background.
You can see either a vase or two faces, depending on whether you define the
background as being the white or the black color.
Source: unknown
A sax player or a young woman's face?
Source: unknown
A bearded man's face with ivory leaves or a couple kissing?
Source: unknown
Is it the word "Liar" or a man's face?
Source: unknown
Download also high-resolution TIFF versions of this illusion:
The face of a young or an old woman?
Source: unknown; on http://mathworld.wolfram.com/YoungGirl-OldWomanIllusion.html (Wolfram Research) you will find more on the history of this illusion
(the drawing was created in 1915 by the British cartoonist W.E. Hill).
Is this a rabbit or a duck?
Source: unknown
