Remember that infamous dress on social media? Was it white and gold, or blue and black? , The answer holds surprising insights into the human brain. NOVA l PBS Facebook Eleven years ago, a single photo posted on Tumblr sparked one of the biggest internet debates of all time. The dress instantly divided the world, some swore it was white and gold, SCOMCHIC Plus Size Deep V Neck Sexy Ruffle Long Sleeve Dress for Women Black Cocktail Dress Wedding Guest Dress Walmart.com 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 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