In 1960s Rio de Janeiro, a multidisciplinary group of artists dedicated themselves to making art that invited active, sensory engagement from audience participants. This neoconcrete group theorized the art object as participatory and relational. The theoretical consequences of this approach to art-making included an expansion of the object’s agency. No longer a static wall-hung work of art, the object was now capable of shaping the engagement of its human participants. Conversely, these participants would share in the object-like qualities of the artwork, merging with it in a relational exchange in which both the human and the nonhuman contributed to the constitution of the work. However, changes to this paradigm arise when the subject (or object) in question is not an abstract participant untethered to notions of gender identity. In Lygia Pape’s work, objects are embodied and bodies are objectified, but, as she shows, this exchange cannot be separated from gender. This essay examines key works by Lygia Pape, including the Neoconcrete Ballet, Divisor, and Eat Me, and argues that her embodied aesthetics, rooted in twentieth century Brazilian art, chart new horizons for feminist posthumanism today.