After his time at the Frankfurt Academy, Karl Marbe became professor of philosophy in Würzburg and successor of Oswald Külpe from 1909-1935. During these years, his research focused on applied psychology on the one hand, and on his great work on Gleichförmigkeit (Conformity) on the other. On this he later built his crowd psychology, which he wrote in secret in Würzburg during the last years of the war.
The photo shows from left to right:
Karl Marbe, Marian Fries, Milly Marbe Fries and August Fries drinking coffee in the garden of Marbe's estate at Judenbühlweg 7, built in 1932.