 The group focused on the unification of the arts by means of "Total Works of Art" (Gesamtkunstwerk) (Von Maur 2001, Hahl-Koch 1985, Ione 2004).Kandinsky's theory of synesthesia, as formulated in the booklet "Concerning the Spiritual in Art" (1910), helped to shape the ground for these experiments.Kandinsky was not the only artist at this time with an interest in synesthetic perception.