visual illusions (what do you see)

What colour is the dress?
(1) blue and black
(2) white and gold
(3) other

The dress is a photograph that became a viral internet sensation on 26 February 2015, when viewers disagreed over whether the dress pictured was colored blue and black, or white and gold. The phenomenon revealed differences in human colour perception. https://en.wikipedia.org/wiki/The_dress