The Science Behind the Dress Illusion Eyepic Eye Care ELI5:Why does this dress appear white gold to some people and black blue to others? : r explainlikeimfive Ten years ago, a photo of a dress posted on Tumblr sparked a massive debate: was it blue and black or white and gold? Millions argued online, and even celebrities joined in. Women's German Dirndl Dress Blue Gold XXL so we know the dress was black and blue BUT that's not what i'm here to discuss : r opticalillusions