In Book 1 of Jalaluddin Rumi's Masnavi, the metaphor of the sun shining on a wall illustrates the illusory nature of worldly love and attachment. The lover of the material world is compared to someone who falls in love with a wall because of the beautiful sunlight reflecting upon it. Ignorant of the fact that the glow and splendor originate from the sun in the heavens rather than the earthly wall itself, the person becomes entirely devoted to the wall. When the sunlight inevitably withdraws and returns to its celestial source, the wall is left dark and cold, and the lover remains forever deprived. This allegory emphasizes that worldly beauty and perfection are merely temporary reflections of Divine Reality, and that true devotion should be directed toward the eternal source rather than its transient reflections.