Architects can enliven buildings with interesting shadows and forms by projecting brick from the wall surfaces. To create corbels that look good and perform well, simply follow the maximum allowable horizontal projections that have been developed empirically. For veneer walls, the total horizontal projection should not exceed one-half the thickness of the masonry wythe. For solid masonry walls, the total horizontal projection should not exceed one-half the actual wall thickness. Each course of brick also can be corbeled only so much. A single brick course projection should not exceed one-half of the sum of the unit height and mortar joint thickness. In veneer walls, a single brick course projection also shouldn't exceed one-third the nominal unit bed depth. In a solid masonry wall, it also shouldn't exceed one-third of the sum of the unit bed depth and collar joint thickness.