The Troxler Effect and the Disappearing Image

If you stare at this image for 20-30 seconds, it should fade away until it completely disappears. I found that it is not quite that simple, but I eventually got it to work.

This is called the Troxler effect, after the man who discovered it; what happens is that your visual system constantly adapts to all the external stimuli. This is why after spending a few moments in the dark, you start to see a little better. This capability allows you to be in different lighting conditions, while still...

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