Fidus (Luebeck 1868-1948 Woltersdorf bei Berlin), also known as Hugo Hoeppener
"Lichtgebet" ["Light Prayer"] (a man adoring the sun)
1928
watercolor over black chalk
25,1 x 14,3 cm
inscribed, monogrammed and dated below: "Lichtgebet / Altarfenster / F. VII, [19] 28"
Presumably the design for an altar window (Altarfenster).