Here's and easy little test for you. Just count how many black dots you can see...
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Look at this image and decide if you think the grey lines are straight or not...
Answer: Incredible as it may seem, the grey lines are straight. Print it out and grab a ruler if you don't believe me!
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Stare intently at the black dot in the centre of this image and watch the grey shadow disappear
This is a static image..It's your own eyes that did that!
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I'll let you figure this one out on your own. I think the drawing is actually quite common.
What do you see?
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Just in case you aren't feeling ill enough already...... To enhance the effect scroll up and down...
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so tell me what you think....
I found these and thought they were pretty cool