Marie Sester's Access is a public art installation that applies web, computer, sound and lighting technology in which a robotic spotlight controlled by web-users tracks individuals in public spaces. An acoustic beam system directs sounds onto the same tracked persons, projecting audio that only he/she can hear. The individual does not know who is tracking him/her or why he/she is being tracked. Nor is he/she aware of being the only person among the public hearing the sound. The tracker doesn't know his/her action triggers sound towards the target. In effect, both the tracker and the tracked are in a paradoxical communication loop.