"Living for Brecht" by Ruth Berlau (Page 195)

Page 195: "Sometimes one can hear Brecht give a sudden laugh-even when the scene is being rehearsed for the first time-for he has observed that the actor is offering something new and interesting, even if nothing more that a silent walk across the stage. This laugh means too much to the actor. From then on his colleagues will say: Now for the walk, or the gesture, or the look."