"Occupy Wall Street exists in a First Amendment space all its own. The protestors do not, in an important sense, occupy the spaces in which they exist to the exclusion of other uses, like a rally or a parade. They depend for their rhetorical force not on a temporary massing of thousands, but on the persistent presence, day in and day out, of a committed core of demonstrators, whose ongoing presence extends the teachable moment of their message into a perpetual, if not permanent, opportunity for dialogue. The Occupy movement, in that sense, is a sort of national sit-in, whose continuing presence forces us to confront those questions we would otherwise more easily avoid. The essential moral challenge is the same as that posed by the lunch-counter demonstrators of the civil rights era: We are here, we politely dissent, and we defy you to move us along for your own convenience."