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 Here's why people saw the dress differently. 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 The Blue Black or White Gold Dress and Questioning Reality Psychology Today Blue Gold Dress Debate Dress Debate Was The Dress Blue And Black Or White And Gold