In his book "A Little Book on the Human Shadow," Robert Bly discusses how society instills a dualistic view of personality from a young age, segmenting traits into light and dark aspects. He describes the "light" side as being associated with qualities often celebrated by the masculine or "father" archetype, which values rationality, action, and material success. On the other hand, the "dark" side represents the intuitive, emotional, and artistic traits linked to the feminine or "mother" archetype.

Bly emphasizes that many artists, poets, and musicians resonate with these darker, often overlooked qualities and appreciate their connection to the mysteries of life, nature, and emotional depth. This division influences how individuals perceive various personas within society, shaping admiration toward those who embody either a solid, action-oriented character or a more fluid, expressive identity. Through this lens, he encourages a broader understanding that embraces both aspects of personality.