Metropolitan areas have citizens of all ages, sizes, and varities.
Individuals will be the first to come to mind. And then you have public entities like suburbs and villages long ago absorbed into the urban net. Religious organizations contribute architecture to the skyline and art to interior spaces. Educational institutions plan and build and plant to add beauty to their campus.
Not to be forgotten are good corporate citizens. You’ve seen them. The ones that landscape their grounds beyond the minimum zoning codes and participate in the life of the community.
Today’s fountain is located at a hospital campus. Geography and zoning may have prompted the formation of the pond while good citizenship and a sense of beauty polished it off.