The dress is blue. Here's why 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 Vintage 1950's Black and White Daisy Floral Cotton Day Dress Daydream XS to Small Etsy Lovely Short A Line Sequined Sleeveless Black Homecoming Dress misshow.com So I searched up the black and blue dress : r opticalillusions