It's all there. Understanding. Understanding why his parents and five other couples, all "left-wing Christians", from different backgrounds, barely knowing each other, one day decided to form a "community". Understanding why, today as yesterday, people invent other ways of being together, and understanding why it affects him so deeply. To understand, you have to question, listen, delve into his memories. Starting from his family story, Emmanuel Lepage, finally, traces a social history of France in the 1960s and 1970s, just as he questions today's attempts to "start everything from scratch".