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 To have the answer about each illusion : put the cursor on the picture and wait : a text will appear. |
| © Ophtasurf, 2000-2006 |
the square seems to be curved |
Which of these arcs belongs to the largest circle ? |
According to you, the red figure is smaller than the green one? |
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| illusion of ehrenstein | ||||
What do you see ? a cube ? |
Which square has a darker red ? |
Are the lines parallel ? |
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Are the boards parallel ? |
How many cubes there are ? You see 7 cubes ? |
In the two rounds, the blue lines are in same alignment? |
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| © Ophtasurf, 2000-2006 |
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