Ten years ago, a photo of a dress posted on Tumblr sparked a massive debate: was it blue and black or white and gold? Millions argued online, and even celebrities joined in. Scientists later explained In 2015, a photograph of a dress went viral, dividing viewers over whether its colors were blue and black or white and gold. This optical illusion highlighted differences in human color perception US figure skater Alysa Liu wins gold, becomes first American woman to medal in 20 years Scientists have FINALLY explained why people couldn't agree on the colour of 'that dress'