This essay considers threshold phenomena as mediums—that is, as technical support—for expression. For illustration, I discuss Shelley Hirsch’s live vocal interpretation of Christian Marclay’s Manga Scroll, a landscape-like musical score composed of onomatopoeias taken from Japanese comics. Hirsch’s performance of threshold enacts expression as a new milieu of experience. Attending to threshold phenomena can show points of contact among mediums and forms of technical support to see how modes of expression fold, unfold, merge, and emerge.

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