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As dusk sets in over South Park, a colorful projection screen stretches across the park’s gazebo, erected more than a decade ago. The sidewalks next to the Roosevelt Fountain are covered with colorful paint, chalk art and vinyl decorations, the fountain itself lit with ethereal colored lights. Speakers underneath trees play audio loops, alternating between historical sounds like blacksmithing and archival newsreels, and the sounds of animals native to the park.