An immersive sound installation that exposes the proliferation of ubiquitous online surveillance via the real time sonification of internet tracking cookies. Named after the computer science term “magic cookie” internet cookies are commonly used for data profiling by advertising, corporations and governments, by placing a small file on the user’s computer. The relative invisibility of digital surveillance, and the proliferation of consumer modes of online surveillance has both intensified and rendered ambivalent our relationships to being surveyed. Sound provides a means for listening back to some of the imperceivable surveillance infrastructures that monitor our habitual online browsing.