 Both value incommensurability and incomparability have been invoked to make sense of a central feature of supposed moral dilemmas—namely, that no matter which alternative the agent chooses, she fails to do something she ought to do. The apparent value conflicts involved in these choices have led some philosophers to relate moral dilemmas to the incomparability or incommensurability of values. Henry Richardson, for example, takes the situation confronting Sophie in the novel Sophie’s Choice—that one of her two children will be spared death, but only if she chooses which one to save—to point to the incommensurability of values (1994, 115–117).