A "panopticon" is a concept originally designed as a type of prison by the English philosopher Jeremy Bentham in the late 18th century. It’s a circular building with a central watchtower where a single guard can observe all the inmates in their cells, which are arranged around the perimeter. The twist? The inmates can’t see into the tower, so they never know if they’re being watched. This setup was meant to induce self-discipline—prisoners would behave as if they’re always under surveillance, even if no one’s actually looking.