Summary In this article the ethical systems of Risieri Frondizi and Maurice Mandelbaum, both decisively influenced by Wolfgang Köhler, are investigated for the first time. Each writer took different things from Köhler, Frondizi the idea of value as a Gestalt quality and Mandelbaum the idea of value as a felt demand. Their positions are highly complementary and Frondizi’s axiological approach enlightens the ontology of value whereas Mandelbaum’s phenomenological approach clarifies the nature of “requiredness” (Köhler) or “fittingness.”.