It says that actually, that dress is color gold and white, but some people see it as me (I promise I see it blue). The experiment says that, depending on the emotional state of the person who is seeing the dress, they see a different color. So, if you see it gold and white, it means that you are in an actual -good mood- but if you see it as blue and black, it means that you had experienced a strong emotion that is affecting the way you see things.