Focusing on two interactive works by the author: Skin (2012/2018) and Mindscape (2016/2018), this chapter describes how the human body is used as an instrument to create interactive audiovisual environments. Driven by the power of the organic body and its internal imperceptible fluctuations this research puts forward the idea that the human body has so far not been perceived in its totality. Based on biofeedback methods and by measuring the body’s physiological parameters via new technologies, these performances/installations propose the usage of the human body as an ‘audiovisual instrument’ that triggers sound and visual elements via the measurement of two biomedical-signals, Galvanic Skin Response (GSR) and Electroencephalography (EEG). Instead of using interfaces for these signals as an extension of the body, these works introduce them as a bridge, a means to help the perception of the human body in a different manner. Physiological activities directly connected to the nervous system are measured and stored in a computer, which thereafter introduces algorithms to project these usually invisible and inaudible internal fluctuations inside the human body to an immersive environment, a space where inner and subtle human manifestations emerge in audiovisual form.