The question of where cognition ends and the world begins has been fundamentally reconfigured by Clark and Chalmers' extended mind thesis, which posits that cognitive processes are not confined to the boundaries of skin and skull but rather extend into the environment through the use of external resources. This framework finds a productive parallel in theories of intertextuality, particularly Kristeva's notion that every text exists as an intersection of textual surfaces rather than a point of fixed meaning. Just as Otto's notebook functions as a constitutive(.o.) element of his belief system rather than a mere external aid, intertextual references operate not as supplementary ornaments but as fundamental components of textual cognition itself. The parity principle demands that if an external process plays the same functional role as an internal one, it should be considered part of the cognitive system; similarly, intertextual echoes must be understood not as peripheral allusions but as essential elements through which meaning is dynamically constructed and sustained across temporal and spatial boundaries. This convergence suggests that textuality, like cognition, is inherently distributed—a network phenomenon that resists the Cartesian impulse to locate meaning within a discrete, autonomous site. The implications extend beyond epistemology into ontology: if the mind can exist partially outside the brain, and if texts exist only in relation to other texts, then the subject itself becomes a permeable threshold(.-.) rather than a bounded entity. Memory, whether stored in neural tissue or on paper, performs identical work in constituting the continuity of self. The horror implicit in this dissolution of boundaries lies not in the extension itself but in the recognition that there may never have been a center to begin with—only an elaborate fiction of interiority maintained through selective attention to certain processes while disavowing others. When Otto loses his notebook, does a part of him die? When a text is torn from its intertextual matrix, isolated within an aperture that severs all connection to the surrounding discourse, what remains is not meaning but its ghostly residue, a fragment insisting on coherence it can no longer achieve.