10 years ago, a simple photograph of a dress sparked a global debate unlike anything seen online before. Posted in 2015, the image caused people to argue intensely over whether the dress 18,643 Dress White Gold Blue Black Stock Vectors and Vector Art Shutterstock Neuroscientists Explain Discrepancy Behind "The Dress" Illusion 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