A stone wall. People build walls for two reasons. To keep others outside or to keep others inside. Both reasons have poor motives. Why keep others outside ? Welcome them inside. Have a drink and a snack ready. Light a fire. Sit together. Share stories. Why keep others inside ? Let them go. See if they will return. If they do return welcome them anew. Ask what new stories they bring to tell from the time they have spent outside. Then you might feel that it is your turn to fetch new stories from outside to people inside. Finally you are convinced you do not need the wall. There is no inside.