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 10 years ago today, this dress was posted online, turning into a viral phenomenon. Viewers couldn't decide if the dress was blue and black, or white and gold. It was later confirmed The Dress": Why People See White and Gold or Blue and Black Cassie Glitter Mesh Maxi Dress Shop American Threads Online Boutique Blue XS 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