A type of technology, similar to Mirrorbox Trap, that precedes all of the invention of speakers and recorders, it is built from Sky Glass and was properly invented and regularized by the Mythical Virtuoso of Luminance, Luminaire.
It is the most basic type of Soul-Casing, and has a clear indicator from Crystal pink when the Resonance Box is occupied with an existing vibration, and a hue of Resonance teal green when it is vacant for recording a new sound.