Popularity of the 'the dress black blue white gold' meme correlates with Number of edits to the Wikipedia article for Justin Trudeau (r=0.854) Blue and Black Dress Illusion Explained What colour do you see be honest, Some people see black and blue., Others swear it is gold and white., Look at the image carefully., Your brain is deciding the colour based on light and contrast., I've been thinking about "the dress" for 10 years. Here's what I've learned.