Rabbi Shimon wishes to know about the echo, and he is told about three sounds, besides the sounds of Torah and prayer, that never get lost. These are: 1) the sound of a woman in labor; 2) the sound of the person when the soul escapes its body; and 3) the sound of a snake when it sheds its skin. These sounds, which are all of pain, linger in the air and wander around the world. When a person raises his voice those sounds are awakened, although the voice of the snake can only be aroused when a person beats something. One kind of sound follows its own kind, so on the day of Rosh Hashanah the sound of the Shofar awakens the sound of another Shofar.