In a text of 1936 entitled ‘Individual dream symbolism in relation to alchemy’, Jung uses some watercolours by Blake as illustrating common symbols that appear in dreams. His interest, though, appears to be in the subject matter and not Blake’s interpretation.
The first is ‘Jacob’s Ladder’: dreams of a female figure (the dreamer’s anima) ascending or descending the stairs represent an ascent or descent in the dreamer’s future.
The second is from Blake’s illustrations of Dante. The anima (Dante’s Beatrice) now appears as psychopomp or spiritual guide.