Constructivist approach teaching methods are based on constructivist learning theory. Constructivist teaching is based on constructivist learning theory. Constructivist architecture emerged from the wider constructivist art movement. Various approaches in pedagogy derive from constructivist theory. He describes this inappropriate use of constructivism as the "constructivist teaching fallacy". Foucault was an epistemological constructivist and historicist. Although Stalin rejected Constructivism, completion of constructivist buildings extended through the 1930s. Foucault is described by Mary Beth Mader as an epistemological constructivist and historicist. Numerous criticisms have been leveled at Constructivist epistemology. These themes led Bachelard to support a sort of constructivist epistemology. In museum education, constructivist theories inform exhibit design. This perspective is firmly rooted in a social constructivist ontology. Realist and constructivist theories are normally taken to be contraries. Montessori education is an example of a constructivist learning approach. It is argued that constructivist theories are misleading or contradict known findings.