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 Optical illusion: Dress colour debate goes global BBC News Gold Blue Dress Brain Test TikTok 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 Can AI Help You Plan the Perfect Cruise Packing List? Cruise Critic The Blue Black or White Gold Dress and Questioning Reality Psychology Today