A photograph doing the rounds on the internet is dividing people across the world.
Some see it as a dress that's white and gold, but others see blue and black.
An article on Wired claims the fight is about how human eyes and brains have evolved to see colour in sunlight.
The photo seems to have hit some kind of perceptual boundary, or simply different versions of the photo show different shades of light that look whiter or bluer.
