In the case of your brick walls, that weakness is the mortar—the cement-like “glue,” visible in the joints between the bricks ...

Notice how the shadow appears to “fall” into the recessed mortar joint; compare the edge of the shadow to the straight edge of the red arrows! Brick detail from two sun angles The next image ...

If the cost of opening a brick-and-mortar joint gives you heartburn, put your meals on wheels and go where the hungry people are! Not only is serving up your stuff to peckish people a satisfying ...