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 Black and Blue or White and Gold? How Your Brain Sees 'the Dress' Business Insider LESY LUXURY FLOWER Blue Girls Sateen Pink Flower Party Dress 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