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| Either scroll the page or slowly move the mouse cursor over the image
whilst focusing on the cursor. |
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| No camera trickery is used here: |
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| The ring of boats appears to rotate slowly clockwise. |
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| run your mouse over the image and focus on the cursor. |
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| Focus on the dot in the centre and move your head towards then away from
the screen. The rings should rotate in different directions. |
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| Stare at the red dot in the centre of the left block for about a couple
of minutes. Then look over to the centre of the right block. And if
that's not freaky enough, move your head closer and further from the
monitor while focusing in the centre. |
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| How many black dots can you see? |
some other optical illuson
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