In her well-known article "A Defense of Abortion", Judith Jarvis Thomson argues that abortion is in some circumstances permissible "even if" the embryo is a person and has a right to life, because the embryo's right to life is overtrumped by the woman's right to control her body and its life-support functions. Her central argument involves a thought experiment. Thomson asks us to imagine that an individual (call Bob) wakes up in bed next to a famous violinist. He is unconscious with a fatal kidney ailment; and because only Bob happens to have the right blood type to help, the Society of Music Lovers has kidnapped Bob and plugged his circulatory system into the violinist's so that Bob's kidneys can filter poisons from his blood as well as his own. If the violinist is disconnected from Bob now, he will die; but in nine months he will recover and can be safely disconnected. Thomson takes it that one may permissibly unplug oneself from the violinist even though this will kill him. The right to life, Thomson says, does not entail the right to use another person's body, and so in disconnecting the violinist one does not violate his right to life but merely deprives him of something—the use of another person's body—to which he has no right. Similarly, even if the fetus has a right to life, it does not have a right to use the pregnant woman's body and life-support functions against her will; and so aborting the pregnancy is permissible in at least some circumstances. However, Thomson notes that the woman's right to abortion does not include the right to directly insist upon the death of the child, should the fetus happen to be viable, that is, capable of surviving outside the womb.