In 2015, a photograph of a dress went viral, dividing viewers over whether its colors were blue and black or white and gold. This optical illusion highlighted differences in human color The dress: Celebrities join the white and gold or blue and black debate Daily Mail Online 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 White and gold? Or blue and black? Dress sets the Internet ablaze with color debate