Why does howl's hair change colour in howl's moving castle?

In "Howl's Moving Castle," Howl's hair changes color as a reflection of his emotional state and inner turmoil. When he is feeling more self-absorbed or selfish, his hair turns a vibrant blonde, while darker shades represent his vulnerability or the weight of his responsibilities. This visual representation emphasizes Howl's complex character and the theme of transformation throughout the film. Additionally, it symbolizes the connection between his magic and his emotional well-being.