1. A computer-implemented method comprising: producing a representation of a graphical element on a two dimensional set of vertices, wherein a metric value is calculated for each vertex in the two dimensional set of vertices; assigning a visual property to each vertex in the two dimensional set of vertices based upon the corresponding metric value; and presenting the assigned visual properties of the two dimensional set of vertices as being offset from another two dimensional set of vertices to provide a three dimensional appearance of the graphical element, the offset separates the two dimensional set of vertices and the other two dimensional set of vertices along an axis orthogonal to the two dimensional set of vertices and the other two dimensional set of vertices.