_log(_rithm) is a multimedia performance of a quartet of two improvisation machines (AIYA & Aiii) and two humans (Melody Chua & Chi Him Chik) that brings selective surveillance, data analytics, and data ownership into a performative question. Both humans and improvisation machines rely on camera, audio, and motion sensors to read the situation of the performance and make musical decisions; this fact is purposefully manipulated through the selective lighting of the performance space, which both hides and reveals the working frame of the quartet. The human performers play with this and their ability to partially evade the sensors of the improvisation machines. Together, they experiment with what happens in an improvised dialogue when one hears/sees/perceives only part of the story.