Here's why people saw the dress differently. Blue Illusion Dress Size XL 16 Black & White Print Midi Cold Shoulder Viscose eBay Australia Leely Women Black Sheath Long Sleeves Evening Dress with Slit Illusion High Neck Ruched Formal Dress Optical illusion renews blue and black dress debate nine years on Express.co.uk In 2015, a photograph of a dress went viral, dividing viewers over whether its colors were blue and black or white and gold. This optical illusion highlighted differences in human color