Here are a few small details about Shenzhen that make me feel a sense of happiness: 1. Public restrooms provide toilet paper, which is very important since nature calls for everyone; 2. Many pedestrian overpasses are equipped with accessible elevators; 3. Traffic police enforce the law gently, with a good attitude. At least so far, I haven't encountered that condescending feeling often found in smaller places; it really feels like being served. What small details in your area have left a deep impression on you?