Together in 1934, Feitelson and Lundeberg founded Subjective Classicism (or New Classicism), which later became known as Post Surrealism. Using her painting "Plant and Animal Analogies" as a case study and an ideal, Lundeberg wrote the New Classicism manifesto. Post Surrealism represented the first concentrated response in the US to European Surrealism. Unlike their European counterparts, American Post-Surrealist artists did not rely on random dream imagery. Instead, carefully planned subjects were used to guide the viewer through the painting, gradually revealing a deeper meaning. This method of working appealed to Lundeberg's highly intellectual sensibilities and her engagement with surrealism is present, to varying degrees, in her work throughout the rest of her career.