The statues, murals, shrines, unique homes and other forms of free public art sprinkled across Marin are now compiled in an interactive online map launched last week by the county’s Department of Cultural Services. Navigable by town, art type and artist, the map aims to show the provenance, evolution and location of public art. It also shows where to find museums and nonprofits across the county that promote film, theater, art, music and arts education.