A 2015 viral debate over a dress's colors with some seeing blue and black, while others saw white and gold sparked widespread discussion and scientific inquiry. The phenomenon, which began Here's why people saw the dress differently. 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 This Dress is Blue and Black, Right? What Colors do You See?