Ciel is a term that refers to the sky, particularly in French. It is often used in literature and art to evoke feelings of openness, freedom, and beauty. The color of the sky can change throughout the day, influencing moods and perceptions. In popular culture, Ciel is also a character from the anime and manga series Black Butler. He is a young nobleman who forms a contract with a demon named Sebastian Michaelis to seek revenge for his family's death. Ciel's character is known for his intelligence, determination, and complex personality.