Nineteenth-century settlers were astounded by the grandeur of prairies on the western plains, particularly those christened looking-glass prairies for their elegant curving shapes and their surprising reﬂectivity. These gleaming prairie wetlands (circumnavigated by prairie schooners)— great shallow basins of sedges, reﬂecting sky and landscape and nurturing ﬁsh, waterfowl, and other animals—were initiated by glaciers retreating from the Central Lowlands, which stretch west from the Mississippi River across the Great Plains. The term is generic, although it can be speciﬁc, as in the 1829 third volume of Travels in North America, where B. Hall writes of one prairie that was “particularly beautiful of its kind, and named Looking Glass Prairie.” Such prairies engender optical illusions and mystical revelations, and it’s worth noting that L. Frank Baum set his Oz books in the magical prairies of Kansas. But alas, most settlers considered looking-glass prairies useless impediments, and busily drained and plowed them.