The poster of Amplitudes 2013 shows "Quadrate mit konzentrischen Ringen" ("Squares with concentrical annuli") painted by Wassily Kandinsky in 1913. Kandinsky is one important representative of the German Expressionist movement and was a founding member of "Der Blaue Reiter" originating from the Neue Künstlervereinigung in München. The picture can be seen at the Städtische Galerie im Lenbachhaus, Bayerische Staatsgemäldesammlungen, München.