On the occasion of the 200th anniversary of the birth of Hermann Gra mann (1809-1877), an interdisciplinary conference was held in Potsdam, Germany, and in Gra mann's hometown Szczecin, Poland. The idea of the conference was to present a multi-faceted picture of Gra mann, and to uncover the complexity of the factors that were responsible for his creativity. The conference demonstrated not only the very influential reception of his work at the...