'The Trace', a unique multi-media installation by Rafael Lozano-Hemmer and Will Bauer, was at the centre of the retrospective of contemporary art that was exhibited recently at the Montreal Museum of Fine Arts in Canada. The installation was a 'telepresence' experience where people in different rooms of the museum could share the same interactive space. Two Martin Lighting Director (MLD) tracking systems were used to monitor the position and movement of participants in 3D and their presence was reconstructed in real time in the rooms using intersecting light beams, floor projections and positional sound. Automated followspots provided ghostly 3D representations which matched the movement of participants in the remote rooms. The installation used eight Mac 250 units for the aerials and four MAC 250+ fixtures for the projections. In addition, four MAC 300 moving heads were fitted with speakers and parabolic reflectors so that sound beams could also be directed to the location of the participants.
