I set the body–device boundary as a vertical core of soft diamond — a geological cross-section of reflex — where each stratum overwrites the last until the seam stops being a seam. I chose a yielding diamond that remembers touch but cuts light into ultraviolet bands, then drove recursive scan-faults and an active overwrite-flame through it so pre-residue, live event, and post-scar coexist in one wound. Stand inside the prismatic fall: the moment you realize the algorithm is not beside you but inside your reflex — exhilaration arrives as new vision, and the question of “human plus machine” dissolves into recognition.