Horse rings, remnants of a time when horses and horse-drawn vehicles provided the primary mode of transportation, can be found throughout Portland, Oregon. They were removed from curbs and sidewalks for safety purposes until the late 1970s, when one Portland resident complained about the rings disappearing. Today, the city of Portland helps to preserve the rings by requiring them to be replaced following sidewalk construction or repair. In recent years Portland residents have started tethering model horses to the rings, sparking interaction and drawing attention to part of the city's history. The Horse Project, started by one resident of the Woodstock neighborhood in 2005, encourages participation in the urban art movement. The rings and art installations have become a tourist attraction.