We are dealing with an igneous (or metamorphic) host rock environment. The terms used are much clearer when applied to sedamentary rock environments. In this situation you might think of Dip as something like lateradl displacement and direction (width)from the Strike (length). The Plunge would be analogous to the direction the Strike (depth). The Strike would be analogous to the direction the mineralization is extending in (length). Thus something of a 3D representation.

Old Joe

PS: It is easier to think of application to setimentary rock environments. Thus Strike = length, Dip = width, and Plunge = depth. These have to be considered in combination with each other, otherwise you can get really mesed up! They create the 3D effect! NOT necessarily the dimensions of the structure but more its orientation.