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