As she turned to give them a last wave, as she always did, she saw their two faces at the window, white masks that dwindled as she walked backwards down the hill, still waving.
Anita Brookner, Providence, end of ch. 12
*Lovely deployment of the were-subjunctive there. (I once wrote a dissertation on the use of the were-subjunctive in British English. Brookner made an appearance.)