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 Here's why people saw the dress differently. This explains how the blue black white gold dress illusion was possible. But it doesn't explain why some people saw it one way and some saw it the other, and no one seemed to see Is The Dress blue and black or white and gold? The answer lies in vision psychology Psychology The Guardian Black and Blue or White and Gold? How Your Brain Sees 'the Dress' Business Insider