Typography relates to the written word in the same way that the voice relates to the spoken word. Based on this assumption, the sound-reactive variable font Phono examines how the image of type can correspond to the sound of speech. The appearance of Phono changes through the interplay of high, medium, and low frequencies. Three equivalent variable axes enable the font to transfer sound details to the typeface. The idea is heavily inspired by the sonagram—a graphical representation of acoustic structures that is often used to analyze speech signals. The fourth axis, “Tone of Voice,” offers the additional option of giving the font a sharp, clear, or soft tone of voice. Phono is the practical result of Paul Eslage’s theoretical exploration in his master’s thesis Type Follows Identity.