This Sex Which Is Not One (1977) by Luce Irigaray is a foundational text of French feminist theory that critiques the phallocentric, "one"-centered nature of Western philosophy and psychoanalysis. Irigaray proposes a pluralistic "feminine multiplicity" and écriture féminine to disrupt the patriarchal, "solid" logic that treats female sexuality and agency as a "lack" or a "mirror" of the male subject.