Christian von Ehrenfels (also Maria Christian Julius Leopold Freiherr von Ehrenfels; 20 June 1859 – 8 September 1932) was an Austrian philosopher, and is known as one of the founders and precursors of Gestalt psychology. Christian von Ehrenfels was born on 20 June 1859 in Rodaun near Vienna and grew up at his father's castle Brunn am Walde in Lower Austria. He joined secondary school in Krems and first studied at the Hochschule für Bodenkultur in Vienna and then changed to the University of Vienna. There he studied philosophy, was a pupil of Franz Brentano and Alexius Meinong, promoted under supervision of Meinong, following him after his move to the Karl-Franzens-Universität (Graz), in 1885 on the topic of Größenrelationen und Zahlen. Eine psychologische Studie ("Relations of magnitude and numbers. A psychological study"). He obtained his habilitiation in 1888 in Vienna with the work Über Fühlen und Wollen ("On feeling and willing"). From 1896 to 1929 he was professor of philosophy at the German university of Prague. Interested in his lectures were among others Max Brod, Franz Kafka and Felix Weltsch. Gestalt psychology The idea of Gestalt has its roots in theories by Johann Wolfgang von Goethe and Ernst Mach. Max Wertheimer is to be credited as the founder of the movement of Gestalt psychology. The concept of Gestalt itself was first introduced in contemporary philosophy and psychology by Ehrenfels in his famous work Über Gestaltqualitäten (On the Qualities of Form, 1890). Both he and Edmund Husserl seem to have been inspired by Mach's work Beiträge zur Analyse der Empfindungen (Contributions to the Analysis of the Sensations, 1886) to formulate their very similar concepts of Gestalt and Figural Moment respectively. Ehrenfels' Gestaltqualitaten also influenced Stephan Witasek's investigations on complexion theory. His analysis of the transition of a melody to another key became famous. Ehrenfels explained that a melody consists of individual sounds, but that it is considerably more than the sum of these notes. The individual notes would be able to join themselves for completely different melodies, while the melody would remain the same, if transposed into another key and containing single tones. This new opinion, that came up to a “perception of the whole” compared to its “parts” Ehrenfels called Gestaltqualitäten (Figure qualities). Compare with: Aristotle (trans. 1952) “In the case of all things that have several parts and in which the whole is not like a heap, but is