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Not since Monica Lewinsky was a White House intern has one blue dress been the
source of so much consternation.
(And yes, it’s blue.)
The fact that a single image could polarize the entire Internet into two aggressive
camps is, let’s face it, just another Thursday. But for the past half-day, people
across social media have been arguing about whether a picture depicts a perfectly
nice bodycon dress as blue with black lace fringe or white with gold lace fringe. And
neither side will budge. This fight is about more than just social media—it’s about
primal biology and the way human eyes and brains have evolved to see color in a
sunlit world.
Light enters the eye through the lens—different wavelengths corresponding to
different colors. The light hits the retina in the back of the eye where pigments fire
up neural connections to the visual cortex, the part of the brain that processes
those signals into an image. Critically, though, that first burst of light is made of
whatever wavelengths are illuminating the world, reflecting off whatever you’re
looking at. Without you having to worry about it, your brain figures out what color
light is bouncing off the thing your eyes are looking at, and essentially subtracts that
color from the “real” color of the object. “Our visual system is supposed to throw
away information about the illuminant and extract information about the actual
reflectance,” says Jay Neitz, a neuroscientist at the University of Washington. “But
I’ve studied individual differences in color vision for 30 years, and this is one of the
biggest individual differences I’ve ever seen.” (Neitz sees white-and-gold.) NEXT
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