色彩論
Bellermann convinced Hagemeister to give up his plans to become a drawing teacher and be an artist instead, helping him to obtain a position in the studios of Friedrich Preller. From 1871 to 1873, he received classically oriented training at Preller's Weimar Princely Free Drawing School, where he was introduced to Philipp Otto Runge's "Farbenkugel" and Goethe's "Theory of Colours", both of which would heavily influence his thinking on the subject.