This book outlines six interactive installation works that form a body of research concerned with the development of interactive, responsive installation works that use the gestures of the unencumbered human body as their central activation and control mechanism. They are therefore an exploration of interactivity, interface technologies and approaches to mapping the sensed data derived from movement in the installation space, onto sound and vision generation schemes. I have conditioned this exploration with a desire to produce art installations; three-dimensional environments that occupy an entire gallery space. The installations were intended to be immersive, and to engage the 'inhabitant' in a direct, visceral and dynamic way. It was intended that the visitor to the installation would require no prior knowledge of the system and, additionally, would require no knowledge of musical practice or the visual arts.