The first objection concerns sound location. Even if sounds are heard as located, it could be held that location is often imprecise or even erroneous, this in turn depending on—and being explained by—the nature of sound waves. Here is a relatively common echo example. Suppose you walk under the rain, your umbrella open. At some point you enter a building with a glass roof. Rain drops on the roof, and no longer on your umbrella. The umbrella attenuates the noise from the roof, which is reflected