Illusions - can you believe your eyes?

Well, can you? ~ Page 1

Which looks bigger?

Which red circle is bigger?
The Lipps Illusion ~ 1897

Parallel or curved?

Are the red lines curved?

Square and circle?

Is that a square and a circle?


Are you certain you can see a spiral?

Colour Spiral or Concentric Circles

What about this one ? A spiral or concentric circles ? Sure ?

spots before the eyes?

Are you seeing spots before the eyes yet? - The Hermann Grid
The intersection you look at won't change colour, but the others will !!

Moving dots

A variation of the Hermann Grid


What about the stripes in the circles? Sure?


What is going on here?
Thiery's figure

Zollner Illusion

The Z?lner Illusion - The longer lines really are parallel!

Triangle 1 triangle 2

How many triangles can you see in each of these 4 pictures
1, 2 or none?

If you see an upside-down triangle in these pictures, what happens to its shape in the bottom right picture?

triangle 3 triangle 4

Kanizsa figures

Muller - Lyer Illusion

M?ler-Lyer Illusion - are the long lines the same length?

corridor illusion

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 pinks ?

How many shades of pink are there in this picture ?
In fact there is only one!


What about this pair of lines?

track lines

And this pair of thick lines?
First noted by Mario Ponzo in 1913

Perspective distortion

Perspective Distortion
The further the figure gets from us the bigger he gets?

Necker cube

Necker Cube ~ 1832
Which face is nearer to you?

Ponzo Illusion

Ponzo Illusion
Which circle is bigger? or are they the same size?

Poggendorff Illusion

Poggendorff Illusion
Would the inclined line make a single straight line?

orbison variant

Orbison Variant
Are these true circles?

A Circle ?

Another Orbison variant - is this really a circle ?

Lipps variant A

Lipps Variant A
What is that diamond doing to that circle?

Lipps variant B

Lipps Variant B
What are the arcs doing to the circle?

Shades of grey

Are the shades of grey different or the same?

Which is larger?

Which of these two shapes is the larger?

Square? in circle

The figure in the circles is actually square.

This page created 3rd June 1999, last modified 19th October 2005

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