[2] He was also an active hot air ballooner, co-founder of the Kaiserlicher Aero-Club at the Johannisthal Air Field near Berlin and won 1st prize in Class 3 in the 1908 International Race with his balloon "Hewald" in the endurance flight.
This frieze was created by the firm Schleicher & Co. after a drawing by August Gaul entitled "Sheep in the Campagna".
[8] Cassirer was a art collector and decreed testamentarially that his entire collection was to be given to the Magistrat von Berlin [de] to be given to the Märkisches Museum as a permanent loan.
The works on display included drawings by Adolph von Menzel, works by Max Liebermann and Max Slevogt, sculptures by Ernst Barlach, Georg Kolbe and August Gaul.
Among the main works in the collection were paintings by French artists such as Gustave Courbet, Édouard Manet, Claude Monet, Edgar Degas, Pierre-Auguste Renoir, Camille Pissarro, Alfred Sisley and Paul Cézanne.