Current permanent public art installations include an interactive water fountain in Boston's Mission Hill Park; Falls Fountain in Festival Plaza, Auburn, Maine; LIttoral Way, a 0.5 miles pedestrian walkway for the Central Artery Tunnel Project; and a permanent installation called Harbor Fog, that is a motion sensor–activated fog, LED light and granite sculptural environment for the Rose Kennedy Greenway created as part of Boston's Big Dig highway project.