The science behind the dress colour illusion Internet The Guardian 10 years ago, this dress was posted on social media causing a viral debate on whether it was blue and black or white and gold. The phenomenon revealed differences in human color The dress was black and blue, but the conditions of the photograph caused many to perceive it as white and gold, creating debate. Within a week, more than ten million tweets had Science Explains Why People Can't Agree On The Color Of This Dress News9.com