When it comes to this country’s courts, longstanding practice, history, and the Constitution make clear that openness—of doors, of evidence, of arguments, of opinions—is the rule. Like the First Amendment’s guarantee of freedom of speech, that rule is not absolute. But it puts in place a default, one that forces those who want to keep court proceedings secret to show, in each case, that secrecy is warranted—and that the need for secrecy overcomes the traditions and values of openness that animate the default rule in the first place.