Ehrenfels, (Maria) Christian (Julius Leopold Karl) von (1859–1933)

Austrian philosopher and psychologist. In his paper Über Gestalt Qualitäten/On Gestalt Qualities (1891), he introduced the notion of gestalt to explain observations of wholeness and object-constancy in perception.

For example, a circle is still seen as a circle even after its size or colour has changed. A whole that retains its specific character when changes occur that affect all its parts he termed a Gestalt and its special property a Gestalt quality. His ideas were important in the early history of Gestalt psychology.