Mary's case has been popularized more, so I'll focus on her. Mary is a brilliant neuroscientist who, we assume, knows all the physical facts about color vision. Furthermore, Mary must have yet to have been exposed to color. Instead, she is forced to explore the world from a black and white room. Although Mary is aware of all her physical facts, until her release from the black and white room she is effectively color blind. After her release, Mary sees red for the first time. It is widely believed that Mary learns something when she sees colors for the first time. Mainly what he learns is what it means to see red. This being the case, Jackson concludes that the physicalist picture is incoherent. First he had all the physical facts. Secondly he had an experience deficit. Ultimately the argument concludes that Mary's prior knowledge was incomplete. If there are other physical facts for Mary to learn, physicalism is false (Jackson