The Beatles' song 'Old Brown Shoe' delves into themes of duality and contrast. Written by George Harrison, the track reflects on the differences between right and wrong, good and bad, and contrasts found in daily life. The song uses the metaphor of an old brown shoe to represent something overlooked or undervalued but ultimately reliable and comforting. It highlights the feeling of finding stability in what may seem old or outdated. Poignant moments in the song include the intricate wordplay and the clever use of opposites, which drive home the message of balance and acceptance of life's inherent contradictions.