Max Ernst, 1921. Surreal industrial-tube creature with a bull's head — proto-Surrealist masterpiece. Tate Modern.
From Wikipedia
The Elephant Celebes is a 1921 painting by the German Dadaist and surrealist Max Ernst. It is among the most famous of Ernst's early surrealist works and "undoubtedly the first masterpiece of Surrealist painting in the de Chirico tradition." It combines the vivid dreamlike atmosphere of Surrealism with the collage aspects of Dada.