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Here’s another staring illusion. Focus on this lightbulb for about 30 seconds without blinking then close your eyes. Did it turn on for you?

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Interesting fact:

This is very much the same as the two previous images, but it’s remarkable how such a simple image can transform once the cells in your eyes get the chance to rest following a period of overstimulation. The longer you look at this bulb, the brighter it’ll appear in the dark.