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 Alanna Halter Cowl Neck Midi Dress ASTR the Label Picture Of Viral Blue And Black Dress Also Shows White And Gold, And Twitter Is Arguing Over It Again Evie Magazine MARLENA DRESS OFF WHITE CULT GAIA I've been thinking about "the dress" for 10 years. Here's what I've learned.