The Box projection (aka cube mapping) is an extension of XYZ To UVW mapping. The cube planes' projection is based on the normal direction of the surface. Box projection provides a quick way to map a Texture on any object without too much distortion. However, the seams between the box's Projection planes may be visible in the render, depending on the surface shape. Figure 1 shows the result of using Box projection on various simple surfaces.
Figure 1: Several simple shapes using Box projection to map a Texture to their surface