I'm reminded here of the Lit. Theory readings for this week. One of the theorists compares poetry to drama in its performativity, and its performativity is exactly the reason that a poem's "meaning" cannot be categorized or nailed down. In the same way, is Barad pointing to the subjectivity in examining what it means to be human? If being human involves performativity, our current rhetoric will never be able to come close to capturing it...which I suppose is where "posthumanism" comes into play as we search for new ways to grapple with articulating subjectivity.