Ecocriticism is catching up with James Joyce. Moving beyond the heritage of Romanticism’s binary opposition between human and nonhuman nature, contemporary critics have explored the entanglement of nature, culture, and the built environment in Joyce’s works. This chapter focuses on Joyce’s evolving presentation of the human body as a natural–cultural entity. His early fictions depict the body as a humbling counterweight to notions of transcendence, especially to Catholic ideas glorifying the spirit. The evolution of his thinking culminates in his portrayal of the body, in Ulysses and Finnegans Wake, as a site of constant transformation, where the human and the nonhuman interpenetrate and shape each other. An influential concept of material ecocriticism is Stacy Alaimo’s ‘trans-corporeality’, which reveals the interlinkage and imbrication of our bodies with each other and ‘more-than-human nature’. Thus, in Ulysses and Finnegans Wake, even biologically dead bodies of the solar system intersect the characters’ lives, through both their material environments and the senses, microbes, and atoms of their bodies.