Black Tie Optional Attire Guide: Wedding Guest Dresses & Tips Lulus.com Fashion Blog So I searched up the black and blue dress : r opticalillusions Internet debates that blue dress (it is blue, right?) The Seattle Times What color is the dress? Why do some people see blue and black and some people see gold and white when looking at a single image of a dress? : r askscience 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 I've been thinking about "the dress" for 10 years. Here's what I've learned.