what a beautiful concept...

synesthesia means "joined sensation" (Greek, syn = together + aisthesis = perception). It refers to an involuntary physical experience in which the stimulation of one sense modality reliably causes an additional perception in a different sense or senses. For example, a synesthete might describe the color, shape, and flavor of someone's voice, or seeing the color red, a synesthete might detect the "scent" of red as well.