Another fundamental problem for pedagogical theories is the theory-practice-
transformation. This problem was introduced by Herbart in 1802. Herbart differentiates pedagogy as an academic discipline and as an artistic practice. Academic theories are derived from principles and made of broad concepts. Artistic practice has to deal with individual circumstances. Since education in practice always takes care for individuals, for Herbart acting as a pedagogue is an art form. Thus teachers are artists. And according to Schiller, artists do play.