心岛未晴北城凉筑
[xīn dăo wèi qíng bĕi chéng liáng zhù]
This poetic phrase paints a picture of isolation and longing, with the heart feeling distant and unwarmed ('island without sunny skies'), juxtaposed against a coldness felt ('Northern city') in architecture or surroundings, conveying loneliness and melancholy.