Christian Daniel Rauch and Karl Friedrich Schinkel are world-famous as sculptors, architects and designers. What is less well known, however, is the close and friendly collaboration between these two geniuses, the creative dialogue from workshop to workshop. Numerous letters exchanged between them were now found in Berlin and Cracow. In this correspondence, which breathes the dust of the studios as well as the esprit of Goethe's time, the spirit of humanistic classicism comes to life. Art is viewed less from the heights of theories than from the everyday perspective of practice in the studios. The total of 55 letters immerse the reader in a world that, thanks to its creations in Berlin and Brandenburg and far beyond, is just as immortal as the lifelong friendship between Rauch and Schinkel. As an artist, Rauch was a solitaire and averse to any collective design, but except with Schinkel, as he noted in his diary, since its flexibility helps right away and never causes lengthy discussions.