feathers generally represent something very similar to the bearer of the feathers — the bird. According to the principle of pars pro toto, a magical form of thinking, the feather signifies the bird, and birds in general represent psychic entities of an intuitive and thinking character.
Von Franz establishes the foundational depth-psychological reading: the feather, by the logic of pars pro toto, carries the full symbolic charge of the bird, linking it to intuition, thinking, and ultimately soul.
, The Interpretation of Fairy Tales, 1970thesis