Optical Illusion
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The only way I could stop the first one in this thread from moving was to focus on a single spot. In the thread Rudy linked, the 3rd post by jpp appeared to move all the time. I never did find a way to stop that illusion. It's a slow Sunday, isn't it. 
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Originally Posted by JDN' date='Oct 2 2005, 07:36 AM
The only way I could stop the first one in this thread from moving was to focus on a single spot. In the thread Rudy linked, the 3rd post by jpp appeared to move all the time. I never did find a way to stop that illusion. It's a slow Sunday, isn't it.
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Do you see Pink Dots in the image below?
READ BELOW FIRST
If your eyes follow the movement of the rotating
pink dot, you will only see one color, pink.
If you stare at the black + in the center, the
moving dot turns to green.
Now, concentrate on the black + in the center of the
picture. After a short period of time, all the pink dots will slowly
disappear, and you will only see a green dot rotating.
It's amazing how our brain works. There really is no
green dot, and the pink ones really don't disappear. This should be proof
enough, we don't always see what we think we see.
READ BELOW FIRST
If your eyes follow the movement of the rotating
pink dot, you will only see one color, pink.
If you stare at the black + in the center, the
moving dot turns to green.
Now, concentrate on the black + in the center of the
picture. After a short period of time, all the pink dots will slowly
disappear, and you will only see a green dot rotating.
It's amazing how our brain works. There really is no
green dot, and the pink ones really don't disappear. This should be proof
enough, we don't always see what we think we see.
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Logic tells me that there has to be a green dot, kcs . . . or a combination that creates green. I believe the illusion has something to do with how the retina picks up the color spectrum, but what do I know.
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That's a cool one JDN... 
I think I can explain the green dot but I can't explain why the pink ones disappear after time.
Like a flash from a camera creates a temporary "burn" in your retina of a blue dot, the pink color used here creates a green dot on your retina.
The flashing pink dot is really just a pink dot "turning off" in succession. I think what's happening is that after a while, the pink dots make green dots on our retina and when one is turned off, we see the resulting green dot...
I think I can explain the green dot but I can't explain why the pink ones disappear after time.
Like a flash from a camera creates a temporary "burn" in your retina of a blue dot, the pink color used here creates a green dot on your retina.
The flashing pink dot is really just a pink dot "turning off" in succession. I think what's happening is that after a while, the pink dots make green dots on our retina and when one is turned off, we see the resulting green dot...