That's cool! It took a while for the pink dots to disappear for me. After a couple times trying, now they'll disappear and if I shift my gaze slightly, the pink dots will reappear after the green one passes...cool.
It's the same effect as the one with the reverse american flag and when you look away you see a flag with the right colors. Do you know what I'm talking about? http://library.thinkquest.org/14028/perception.html
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