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Lauren Hutchinson talks to Omar Kholeif curator of London's ' Electronic Superhighway' exhibition, a journey through digital art over the past 50 years. (Photo caption: Rafael Lozano-Hemmer, Surface Tension (1992), plasma or rear-projection screen, computerised surveillance system, custom‐made software, dimensions variable. Courtesy the artist and Carroll/Fletcher, London. Installation photograph by Maxime Dufour © Rafael Lozano-Hemmer)