南城青砖北城绿瓦
[nán chéng qīng zhuān bĕi chéng lǜ wă]
'Green Tiles in North City and Blue Bricks in South City' is a romantic metaphor for nostalgia and memories. The contrasting images evoke the historical charm of different parts of an ancient city, perhaps hinting at a longing for the past or specific experiences.