Poems from his earlier books display a mastery of formal verse with a modern sensibility that viewed such topics as automobiles, house flies, and drug stores as worthy of attention. In 1963, the poet/critic Randall Jarrell praised Shapiro's work:Karl Shapiro's poems are fresh and young and rash and live; their hard clear outlines, their flat bold colors create a world like that of a knowing and skillful neoprimitive painting, without any of the confusion or profundity of atmosphere, of aerial perspective, but with notable visual and satiric force. The poet early perfected a style, derived from Auden but decidedly individual, which he has not developed in later life but has temporarily replaced with the clear Rilke-like rhetoric of his Adam and Eve poems, the frankly Whitmanesque convolutions of his latest work. His best poem--poems like "The Leg", "Waitress", "Scyros", "Going to School", "Cadillac"--have a real precision, a memorable exactness of realization, yet they plainly come out of life's raw hubbub, out of the disgraceful foundations, the exciting and disgraceful surfaces of existence.