Nearly everyone cares—or says he cares—about art. After all, art ennobles the spirit, elevates the mind, and educates the emotions. Or does it? In fact, tremendous irony attends our culture’s continuing investment—emotional, financial, and social—in art. We behave as if art were something special, something important, something spiritually refreshing; but, when we canvas the roster of distinguished artists today, what we generally find is far from spiritual, and certainly far from refreshing. It is a curious situation. Traditionally, the goal of fine art was to make beautiful objects. The idea of beauty came with a lot of Platonic and Christian...