Eleven years ago today, an image of a dress shared on Tumblr ignited a worldwide viral debate. It was eventually confirmed that the dress was black and blue. 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 Green Gold Dress Illusion Science Of 'the Dress': Why We Confuse White Gold With Blue Dark Royal Blue One Shoulder Bridesmaid Dresses Prom Gown TheCelebrityDresses What colour is the dress? Science may have the answer The Week