That's a great optical illusion which got viral 2 days ago and it divided internet population to 2 groups - those who saw "white and gold" and those who saw "blue and black" (who were in minority). Even many celebrities got involved.
Of course, what might see as white is actually blue. It was quite well explained on many sites already. Since I have here a nice collection of color illusions as well, BrainDen was quoted in several articles about that dress (Washington Post, Guardian etc.).
Thanks for sharing the illusion. Keep them coming.
Enjoy the Den