Wallace Stevens's poem "Someone Puts a Pineapple Together" contains his most complete figure on the workings of the self's noetic cosmos, the figure being a system of three planets, which accounts for the development of reason from its first stages all the way to its highest in art. This figure provides unusual insight into the most prominent theoretical issues in his poetry: the relationship between reality, reason, and art; and the relationship between subjectivity, intentionality, and externality.