There is a widely held assumption that it is rarely examined: that privacy and openness are opposites. It is believed that to be private is to be closed, and to be open is to be exposed. That the two exist on a single axis, and any movement toward one is a movement away from the other. This assumption is wrong. More than that: acting on it in the AI era has become dangerous. The old architecture For centuries, privacy was understood not as concealment but as architecture. Cer