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While many black tie events still follow tradition and display a preference for higher hemlines, cocktail dresses are now widely acceptedunless the host specifically says otherwise

The battle, it says, is about more than just social media its 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, writes Wireds Adam Rogers

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Usually, it does this very well allowing for something called "colour constancy" the way that objects of the same colour are perceived the same even under different illumination conditions