. Echoes of bats and men . Fig. 4. Sound does not cast sharp shadows, but it does go around corners as well as being reflected back from solid objects. placed between the sound source and the listener's ear. Sound goes around comers more easily, and conse- quently it is more difi&cult to exclude it from a house or room or from a piece of scientific apparatus (Fig. 4). Even though sounds can be reduced in loudness by walls and other barriers, we seldom think about the degree to which they are blocked, transmitted, or reflected. So un- 43

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