 Sentiments of rationality operate not just in logic or science, but in ordinary life. When we first move into a room, for example, “we do not know what draughts may blow in upon our back, what doors may open, what forms may enter, what interesting objects may be found in cupboards and corners.” These minor uncertainties act as “mental irritant[s],” which disappear when we come to know our way around the room, to “feel at home” there (WB 67–8).