▁war ▁recuper ating ▁before ▁res uming ▁his ▁studies ▁in ▁a ▁master ▁class ▁at ▁the ▁Kar ls ru he ▁Academy . ▁In ▁ 1 9 2 4 , ▁Hub buch ▁was ▁given ▁a ▁position ▁as ▁an ▁assistant ▁l ith ography ▁instruct or ▁at ▁the ▁Kar ls ru he ▁Academy . ▁He ▁became ▁the ▁head ▁of ▁the ▁drawing ▁department ▁the ▁following ▁year , ▁and ▁in ▁ 1 9 2 8 ▁he ▁was ▁appointed ▁professor . ▁ ▁During ▁this ▁period , ▁Hub buch ▁was ▁much ▁more ▁active ▁as ▁a ▁draft s man ▁than ▁as ▁a ▁painter . ▁His ▁draw ings ▁and ▁prints ▁of ▁the ▁early ▁ 1 9 2 0 s , ▁sharp ly ▁real istic ▁in ▁style , ▁are ▁highly ▁critical ▁of ▁the ▁social ▁and ▁economic ▁order . ▁A ▁trip ▁to ▁Berlin ▁in ▁ 1 9 2 2 — d uring ▁which ▁he ▁met ▁George ▁Gros z — in sp ired ▁the ▁creation ▁of ▁several ▁draw ings ▁in ▁which ▁Hub buch ▁dep icted ▁himself ▁as ▁an ▁observer ▁who ▁react s ▁to ▁the ▁urban ▁dynam ism ▁surrounding ▁him . ▁He ▁exhib ited ▁several ▁draw ings ▁and ▁prints , ▁as ▁well ▁as ▁his ▁oil ▁painting , ▁The ▁Class room , ▁in ▁the ▁sem inal ▁" Ne ue ▁Sach lichkeit ' ▁(" New ▁Object ivity ") ▁exhibition ▁at ▁the ▁Kunst h alle ▁in ▁Mann heim ▁in ▁ 1 9 2 5 . ▁ ▁On ▁ 4 ▁January ▁ 1 9 2 8 ▁he ▁married ▁H ilde ▁( née ▁Is ay ; ▁ 1 9 0 5 – 1