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 perception Viral online dress debate turns 10. What colours do you see? The white gold or blue black dress: The widely published original Download Scientific Diagram The actual dress was black and blue. The confusion came from how lighting and color perception tricked people's brains, making some see it as white and gold. It became a viral example Why the #whatcoloristhisdress frock is actually blue and black CNET