Color vision is our brain’s response to light reacting with our eye’s cone cells. Humans have three types of cone cells, each reactive to a different color: red, green, or blue. But color perception is subjective, and different people see colors differently. Recently a striped party dress caused an online frenzy because there’s no consensus on its color. Is the dress white and gold, or blue and black? Mostly, people just felt confused. To help, here’s a round up of sites on how we process colors.