"The Dress" is a photograph that became a viral internet sensation on 26 February 2015, when viewers disagreed over whether the dress was coloured black and blue, or white and gold. The phenomenon revealed differences in human colour perception, which have been the subject of ongoing scientific investigations into neuroscience and vision science, with a number of papers published in peer-reviewed science journals.
The photo originated from a washed-out colour photograph of a dress posted on the social networking service Tumblr. Within the first week after the surfacing of the image, more than 10 million tweets mentioned the dress, using hashtags such as #thedress, #whiteandgold, and #blackandblue. Although the actual colour was eventually confirmed as black and blue, the image prompted many discussions, with users debating their opinions on the colour and how they perceived the dress as a certain colour. Members of the scientific community began to investigate the photo for fresh insights into human colour vision.
The dress itself, which was identified as a product of the retailer Roman Originals, experienced a major surge in sales as a result of the incident. The retailer also produced a one-off version of the dress in white and gold as a charity campaign.