Ruskin’s drawing depicts mountainous “heights of wisdom” rising over a ravine labeled the “depths of folly,” through which runs the “rivulet of vice.” As one of his first extant drawings, the drawing thus points to allegorical reading that, according to Praeterita, formed his Sunday fare in early boyhood (Ruskin, Works, 35:??). Bunyan’s Pilgrim’s Progress . . . [is or is not a possible specific source?] The same allegorical impulse governs the poem “On the Rainbow: In Blank Verse,” which Ruskin placed at the end of the MS I poetry anthology, closest to this drawing. A less specific allegorical idea frames another very early poem, “Glen of Glenfarg.”