Time space body
The effect of technologically mediated self-perception through a camera is particularly powerful in spatial situations that include the observer. For example, Bruce Nauman produces in «Live-Taped Video Corridor» (1969–1970) irritations of the experience of space and time caused by the feeling of physical presence or absence. Nauman specifically emphasizes in his arrangement the aspect of dependence of physical impressions in perceptions of time. In contrast, Dan Graham thematizes time as a dimension that can be experienced in space. With his installation «Present Continuous Past(s)»[23] he treats the relationship of spatial and temporal experience. Perception usually takes place in the present. We are thus are not in the position of perceiving things past or future. Graham constructs a space that makes the phenomenon of constantly continuing presence available to experience by visualizing temporal distance in space. While Nauman and Graham precisely emphasize breaks and discontinuities in the experience of time, Bill Viola produces in his installation «He Weeps For You»[24] (1976) the experience of continuity, constancy, and the connections between micro- and macrostructures. He produces a space of experience based on total perception. In so doing, he addresses «archetypal» notions like the inexorable cycle of renewal, and produces a situation of perception that is directed towards primeval forms and patterns for conceiving human life. By focusing the gaze on a constantly falling and acoustically amplified water drop, Viola shows the smallest events magnified many times over, thus

directing attention towards the observation of constancy and one's own consciousness.[25] The personal experience of a continuous time is thus amplified by the observation of the constantly newly emerging drop that reflects the observer.

http://www.mediaartnet.org/themes/overview_of_media_art/perception/11/