Well, can you?
Muller-Lyer Illusion - are the long lines the same length?
What about the two red lines in this image?
Look at the black centre of this image.
What happens to the grey area surrounding it ?
Look at the bulb for 30 seconds, then at the white area to the right.
The bulb will switch itself on!
Look at this image for 5 seconds, close your eyes and look at the white area
How many shades of pink are there in this picture ?
In fact there is only one!
What about this pair of lines?
The above illusion was first described by psychologist Wilhelm Wundt in 1858. The botton horizontal line has to be extended by up to 30% to match the perceptual length of the vertical line
And this pair of thick lines?
First noted by Mario Ponzo in 1913
Perspective Distortion
The further the figure gets from us the bigger he gets?
Necker Cube ~ 1832
Which face is nearer to you?
Ponzo Illusion
Which circle is bigger? or are they the same size?
Poggendorff Illusion
Would the inclined line make a single straight line?
Are the shades of grey different or the same?
Which of these two shapes is the larger?
Hering, Lipps, Orbison, and Wundt Illusions
Karl Ewald Konstantin Hering (5 August 1834 - 26 January 1918) was a German physiologist who did much research in color vision, binocular perception, eye movements, and hyperacuity. He proposed opponent color theory in 1892. He was born in Alt-Gersdorf, Kingdom of Saxony, and studied at the University of Leipzig and became the first rector of the German Charles-Ferdinand University in Prague.
In 1861, he described one of the classic optical illusions where two straight and parallel lines are presented in front of a radial background (like the spokes of a bicycle), the lines appear as if they were bowed outwards.
Other pyschologists such as Theodor Lipps (1851-1914), William Orbison (1912-1952) in 1939, and Wilhelm Wundt (1832-1920) also described similar illusions.
Are the red lines curved?
Is that a square and a circle?
Orbison Variant
Are these true circles?
Another Orbison variant - is this really a circle ?
Lipps Variant A
What is that diamond doing to that circle?
Lipps Variant B
What are the arcs doing to the circle?
The figure in the circles is actually square.