Watercolour, 44 x 30 cm, lo. ri. sign. a. dat. Maetzel 22, matted a. framed under glass, uninspected out of frame. - Painter, architect, graphic artist a. sculptor. M. was co-founder of the Hamburg secession a. its chairman until 1933. He is one of the main exponents of Hamburg expressionism. - Mus.: Hamburg (Kunsthalle), Kiel, Schleswig (SHLM) a. others - Lit.: Thieme-Becker, Vollmer, Rump, Der Neue Rump a. others.