When Ophelia tells Hamlet, in the Nunnery Scene, that Polonius is “at home” is she lying?
No. For one thing, Polonius and his family live in the castle. Since Polonius is within the castle, he is “at home.” Also, when performed properly, Ophelia will glance at the arras as she gives her reply, thus informing Hamlet with her body language exactly where Polonius is. There is more to human communication than spoken words, and there is more to a play than the words in the script. Plays have action.