Introduction -- Part 1. Invisible Instruments. Gestural Systems for Musical Performance ; Design Approaches -- Part 2. Performer Approaches. Laetitia Sonami ; Atau Tanaka ; Vocal and Breath-based Gestural Systems ; Pamela Z ; Julie Wilson-Bokowiec ; Lauren Sarah Hayes ; Bent Leather Band ; Design Reflections ; Mark Coniglio ; Garth Paine ; Intangible Spaces -- Part 3. Synergy and Transformation. Expanding Agency ; Reimagining Identity