Mojo (2008) 

Christian Moeller

DESCRIPTION:  45-foot kinetic painted steel and metal halide sculpture topped with a 4-foot steel robotic arm and spotlight with movement-tracking software

Moeller describes his kinetic sculpture as "a robotic arm holding a theater spotlight [that] shines a perfect circle of light onto the sidewalk following the passers-by with its light beam" (christianmoeller.com/Mojo).   NOTE:  The sculpture's robotic arm and spotlight tracking feature appear to now be disabled.
LOCATION:  northeast corner of Seventh Street and S. Centre Street, Long Beach, California, USA