The chains are holding back a pile of flat rock rubble drawn using a custom crosshatch pattern by Watson Kilbourne (Tip #1925). The C-RUBBLE.PAT file contains the required definition to draw a pile of flat rocks as a cross-hatch pattern when located in the AutoCAD support search path (figure 1).This excellent crosshatch requires a sizable scaling factor (set the scaling value in the Bhatch dialog box) for most model space applications.