A few weeks ago, someone posted a picture of a dress online that became a viral sensation. It seems that most of the people who looked at the photo thought the dress was gold and white; but a significant number claimed it was blue and black. When I looked at the image, I wondered what the fuss was—since the dress was clearly gold and white, with no hint of any other color. Nevertheless, the posting promised a scientific explanation for the color dispute, so I dutifully clicked on the link provided and read the information. When I returned to the original image, I have to admit, I was a little freaked out by what I encountered.