She loved going to the disco. When her parents picked her up, they wondered each time: “How can you bear it with that noise?” But she knew: the music is only loud at the beginning. Soon the music is no longer loud. The ear adjusts the volume accordingly. In bed in the evenings she loved to listen to the radio, turned down low. Okay, her parents had forbidden it when she had school the next day, but she turned the volume down so low that even she hardly heard anything. She knew: the music is only low at the beginning. Soon, quiet is no longer quiet. She can turn the radio down many more times, and she still hears everything. The ear adjusts the volume accordingly.