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 The Great Dress Debate: Black and Blue or White and Gold? The Dress Debate: Science Explains Why Some See Blue And Black And Others White And Gold 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 Black and blue, or white and gold? 'The dress' turns 10 years old WFLA