In my mind, Taipei is the city of all cities. It is the epitome of a big city. Objectively, it's not the biggest city in the world or anything (however you want to define a big city), but how I feel about a city isn't based on objective factors. For me, Taipei is THE big city.
Taipei feels huge and fast-paced to me. Everything seems to be more crowded, businesses and establishments are open so late, and it feels impossible to discover everything about the city. I feel so little. I'm in the presence of something great.