The English word confinement has changed quietly in the last few years. Before 2020, it mostly meant prison. After 2020, the meaning expanded. In What Confinement Made, Risto follows four people who, long before any of this, were forced into rooms they could not leave — and turned that stillness into books the world is still reading. Boethius, the Roman senator who wrote one of the most widely read books of the next thousand years while awaiting execution. Marco Polo, who would never have dictated his travels if Genoa had not won a sea battle. Charles of Orléans, who came back from twenty-five years in England a poet in two languages. And Cervantes, who started Don Quixote in a debtor's cell at the age of fifty. The walls were going to be there anyway. What they made inside them is the only reason we know their names.