Aside from inducing a sense of calm, moving water tends to have a psychologically cooling effect, and it softens or masks surrounding noise. In the built landscape, it can be incorporated in many ways. A few of these features are meant to be interactive while others are not; several of them emphasize the water, which is more subtle or secondary in other cases; and some were designed to mimic nature whereas others are geometric in pattern or form. In all cases, the inclusion of water clearly adds to the appeal of these outdoor spaces.