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. Scientists later explained Kpop Black Dress Etsy Optical illusion dress inspires Halloween outfit in blue, black, white and gold Daily Mail Online Optical illusion: Dress colour debate goes global BBC News 10 years ago, a simple photograph of a dress sparked a global debate unlike anything seen online before. Posted in 2015, the image caused people to argue intensely over whether the dress I See White and Gold, but the Dress Taught Me How We Shape Our Own Reality by Shaant A Culturated Medium