Rome may have not been built in a day, but that’s not true in the case of a new children’s playground on the city’s South Side. In less than 8 hours, more than 200 volunteers built a new playground at the Jim Mattox Park, which is located at 1250 Mission Grande on the city’s South Side. The playscape made its debut on the evening of Dec. 6. The labor may have taken only a day, but the actual planning for the park goes back to October. Several organizations teamed up to host a Design Day…