Shoutbox

Then if you look a little bit lower or something on the screen you can see a green ring... or if you look at a light (white) background or wall with enough light you also see a green ring.

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Originally posted by Jimcando

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Originally posted by mwe99
but can you make it go backwards?

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Stand upside down?

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it would still spin the same way

sweet

that's amazing tho i've seen it before but i always thought there really was a green dot.
? ah well.

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Originally posted by toddiot
seen it before

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I second that thought

But it is a really good illusion

Seen that one before amazing aint it

actually its easily explained...
the ring consists of pink dots, and at every moment, 1 pink dot would be missing from the ring. the "missing" pink dot moves around in a circle
your eyes have colour detecting cells at the back of your eye, forming part of the retina. they detect the colours of everything you see
as you look at the screen at the +, or anywhere else, as long as you keep your eyes steady, the light from the circles fall on the same part of your eye, namely, the fovea where the picture is focused. hence, the cells detecting the colour pink quickly get tired, and hence when the "missing" pink dot falls on your eye, the cells detecting pink does not get activated as strongly as all the other cells, hence, white-pink= green, and you see green.
however, following the "missing" pink dot causes your eye to move, allowing light to fall on different parts of the eye. hence, the cells do not tire as quickly.
you can show that your eye cells recover pretty fast. look at the picture and blink rapidly, allowing your eyes to recover with each short blink. you will see no green dot.

I am now scared

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Originally posted by Phazeus
you can show that your eye cells recover pretty fast. look at the picture and blink rapidly, allowing your eyes to recover with each short blink. you will see no green dot.

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Now thats pretty nifty

I've seen it before, it is really weird...

Interesting.

Good find.