Some people see the dress as black and blue. Others see it as white and gold. According to the store website, it's blue and black.
According to Pantone, the world's leading authority on color, the human eye and brain work together to turn light into color. The retina in your eye is covered with light-sensitive cells shaped like rods and cones. These are the receptors that filter the light you see into nerve impulses that then travel to your brain through the optic nerve.
No one person's arrangment of cones is the same, which will cause everyone to perceive color differently. This doesn't mean someone is wrong for seeing one color, and someone else is right.
And according to Thomas Stokkermans, the optometrist who directs the optometry division at UH Case Medical Center in Cleveland, the time of day and our surroundings can affect how we see color.
"Our brain basically biases certain colors depending on what time of day it is, what the surrounding light conditions are," Stokkermans told ABC News. "So this is a filtering process by the brain."
According to Dr. Lisa Lystad, a neuro-opthalmologist at Cleveland Clinic's Cole Eye Institute, people can also see colors differently based on their memories and past experiences.
So stop telling your co-workers they are color blind. It's an optical illusion.