I have long thought that flying in formation was a good metaphor for marriage.
How do they do it?
1. There is a leader and the rest are followers. If there is no leader you are not flying in formation.
2. Everyone knows where they are going, but the leader leads and the followers have to keep a close eye on the leader. The followers job is to position themselves correctly in relation to the leader.
3. The leader has to call the manuevers so that the followers can expect the movements and react to them accordingly. They communicate constantly as needed.
4. There has to be at least two, but structurally you can add on more.
5. Not easily done. It takes intention and practice.
When done well it is a beautiful thing. They are commonly seen at air shows.
It is also mandatory for safety in aerial combat. Singles are picked off like sitting ducks. You need someone to check your six. No individual has complete vision or situational awareness. But good teams are unbeatable.