It symbolizes lost souls, memories, and the past of Wuthering Heights. Cathy's soul is ignited in Heathcliff's past, and because of Heathcliff's obsessive love, she vindictively pursues him until the end of his life. She is also waiting for him to be with him right now. Cathy and Heathcliff desire to be together in the countryside. Just like in their youth... They are cursed together and become two lost souls wandering the world.