From Wikipedia:

Lozano-Hemmer is best known for creating and presenting theatrical interactive installations in public spaces across Europe, Asia and America. Using robotics, real-time computer graphics, film projections, positional sound, internet links, cell phone interfaces, video and ultrasonic sensors, LED screens and other devices, his installations seek to interrupt the increasingly homogenized urban condition by providing critical platforms for participation. Lozano-Hemmer’s smaller-scaled sculptural and video installations explore themes of perception, deception and surveillance. As an outgrowth of these various large scale and performance-based projects Lozano-Hemmer documents the works in photography editions that are also exhibited.