A body is used as an interfering sensor to capture the rhythm caused by its presence in a crowd, by measuring the frequency of passerby collisions.
 The performer stands still in a crowd in the most densely populated district in Hong
Kong. The body performs no action, even so, interaction cannot be avoided, and his presence creates flow interference. It makes individuals change their paths and originates multiple chain reactions. The touches of the crowd elements in the performer’s both arms are recorded through the use of several contact microphones connected to a recorder and a headphone set. The headphones isolate the performer’s audition, he can only listen to the sound of people touching him.The recorded data originates a score that interferes with the video playback. The video presented consists on the performance interference in its own documentation.