A mesh created using a virtual aggregate for the polygons and another virtual aggregate for the square knobs. For the polygons, the virtual aggregate is passed a prototype for a polygon, and an array containing the list of points and the color for each polygon. The virtual aggregate then pretends to allocate an object for each element of the array, but actually just draws the prototype object repeatedly.
Kenneth J. Meltsner. ``A Metallurgical Expert System for Interpreting FEA,'' Journal of Metals, Oct, 1991, vol. 43, no. 10, pp. 15-17.