This question alludes to thoughts about front-yard design space. As houses get closer together, residents still want both connection and privacy. A raised area (porch, patio, etc), frequently provides this. With a raised porch that goes right to the sidewalk, a resident could move their chair close to the edge to talk to pedestrians or move chair away from sidewalk toward house for less talking.

The playborhood people did a similar thing to GP: "Mike also made another simple-but-radical move: In a neighborhood in which front yards are for admiration only, Mike installed a picnic table, close to the sidewalk, where he and his family often sat, so that people walking by would have to talk to them." https://archive.is/uLa77#selection-749.0-749.254