To even out any uneven heights in earthen walls. After earthen walls are finished, one can stand on the top, using the hoe with the aiming reticle placed directly at your feet (looking down from directly overhead), slowly walk forward and click. For some added flavour, alternating between pathen & cobblestone, will alter the texture/pattern on the sides of one's earthen walls. One can also similarly use the Cultivator, which should also alter the texture on the sides of the wall, and allow the planting of carrot, turnip & onion, adding some flowers to the top of earthen walls.