Optical Illusion
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That is crazy, thanks for posting
#12
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Check this link for all sorts of Optical illusions with nice technical details
http://www.michaelbach.de/ot/index.html
http://www.michaelbach.de/ot/index.html
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Originally Posted by Rudy' date='Oct 18 2005, 08:53 AM
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...
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Originally Posted by JDN' date='Oct 18 2005, 11:26 AM
Sounds OK to me, Rudy, but I do have one question. Are you sure the pink dots are shutting down? If I don't stare at the center +, the pink dots just keep on keeping on.
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Here is what's happening...
The pink dots arranged in a circle are stationary. They don't move. Now, as soon as one flashes off then on, the next one flashes off then on. Just as Rudy described it. This quick succession creates the illusion of movement. Again, nothing is really moving.
Where is the green dot coming from?
As a test, cover all the dots with something except for one of them. You will notice that the pink dot actually doesn't flash "off" as I described above. Instead it flashes "green" for such a brief moment before returning to "pink" again.
Why do I only notice the green dot when I stare at one point?
Light passes through the front of our eyes and is projected to the back part called the retina. The retina of our eyes is composed of specialized photoreceptors called rods and cones. Cones sense only color while rods sense only light. When we look at a subject, that image is focused in an area of our retina that is highly concentrated with cones (fovea centralis). Everything outside of this area is mostly rods (also called the "periphery"). Hence, our fovea centralis picks up this super-quick transition of color when we are focused at the subject or focused somewhere near the subject that changes color. You can stare at any of the dots and notice it will flash green.
Why do some of the pink dots seem to disappear?
This occurs to the pink dots in your peripheral vision. As you are staring at something, that subject is in complete focus, however, without moving your eyes off that subject, you are still able to see things around that subject but a bit blurry...that is what peripheral vision is. Now, the image of some of the pink dots in your peripheral vision are falling into a part of your retina called the optic disk. This area has no rods or cones, hence, no info can be sent to the brain.
As a test, cover your left eye with your left hand. Now stare at the dot at the 9 'o-clock position and move your head closer towards your monitor but very slowly. As you're doing this, do not take your focus off the dot at the 9 'o-clock position. You'll notice that the pink dot on the opposite side of the circle (at the 3 'o-clock position) will disappear (the image is being projected onto the optic disk of your retina). Now, slowly keep moving towards your monitor and it will eventually come into your peripheral vision again.
The pink dots arranged in a circle are stationary. They don't move. Now, as soon as one flashes off then on, the next one flashes off then on. Just as Rudy described it. This quick succession creates the illusion of movement. Again, nothing is really moving.
Where is the green dot coming from?
As a test, cover all the dots with something except for one of them. You will notice that the pink dot actually doesn't flash "off" as I described above. Instead it flashes "green" for such a brief moment before returning to "pink" again.
Why do I only notice the green dot when I stare at one point?
Light passes through the front of our eyes and is projected to the back part called the retina. The retina of our eyes is composed of specialized photoreceptors called rods and cones. Cones sense only color while rods sense only light. When we look at a subject, that image is focused in an area of our retina that is highly concentrated with cones (fovea centralis). Everything outside of this area is mostly rods (also called the "periphery"). Hence, our fovea centralis picks up this super-quick transition of color when we are focused at the subject or focused somewhere near the subject that changes color. You can stare at any of the dots and notice it will flash green.
Why do some of the pink dots seem to disappear?
This occurs to the pink dots in your peripheral vision. As you are staring at something, that subject is in complete focus, however, without moving your eyes off that subject, you are still able to see things around that subject but a bit blurry...that is what peripheral vision is. Now, the image of some of the pink dots in your peripheral vision are falling into a part of your retina called the optic disk. This area has no rods or cones, hence, no info can be sent to the brain.
As a test, cover your left eye with your left hand. Now stare at the dot at the 9 'o-clock position and move your head closer towards your monitor but very slowly. As you're doing this, do not take your focus off the dot at the 9 'o-clock position. You'll notice that the pink dot on the opposite side of the circle (at the 3 'o-clock position) will disappear (the image is being projected onto the optic disk of your retina). Now, slowly keep moving towards your monitor and it will eventually come into your peripheral vision again.
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Originally Posted by Rudy' date='Oct 19 2005, 03:05 PM
Yeah, like that...
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...and this is really the simplified explaination.
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