It divides but doesn't conquer. It separates while uniting. The urge to see behind, over, or through it creates mystery and interest. Traditionally, the surface is painted with a slaked lime whitewash known as cal, simply left white or mixed with colors. Life happens to the wall.
Dogs use it.
Sellers squat against it. Teenagers embrace against it. Plants affix themselves to it. The seasons etch their message across its face.