I've been thinking about "the dress" for 10 years. Here's what I've learned. Optical illusion renews blue and black dress debate nine years on Express.co.uk Beaded Cutout Prom Dress With Slit 49995 Jovani 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