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First, try sitting in a dark room for 20-30 minutes, and then look at the image again

That doesn't have to be true if it's the right combination of details

"What's happening here is your visual system is looking at this thing, and you're trying to discount the chromatic bias of the daylight axis," Bevil Conway, a neuroscientist who is now a senior investigator at the National Eye Institute and the National Institute of Mental Health, told Wired at the time