“Fascinated by the work of English neurophysiologist William Grey Walter (1910-77), who invented small robots (called Machine Speculatrix) that simulated basic neurophysiological behaviour, Vogel was intrigued to discover that, with the help of sound and light sensors, such machines could react to the world. Thus, at a time when many artists were pursuing the idea of the viewer as active participant, Vogel began to embrace interactivity as a major theme in his work. And all of this prompted him to move away from painting and start to create picture-like interactive objects.”
– Jean Martin. Full essay: http://vogelexhibition.weebly.com/jean-martin-peter-vogels-interactive-sound-art.html