New York City have different places that pedestrians can enjoy. The bowling green is a square surrounded by big buildings which make the place like a close open place. Also, there are other places by the city where there are parks and plaza with more open spaces which are not enclosed like bowling green. Every place has its function to the community.
The use of different materials in bowling green make people feel like they are moving from one place to another even though they are in the same square. While, the use of the same material make people feel like they are in the same place