Overhead wayfinding. The yellow ones are exit numbers so you surface at the right location, you can see colored squares with numbers that are the various metro lines at this station. Note how many signs are visible in this one picture- it's easy to simply follow the sign for your exit or metro line and not get lost.
This long hallway was entirely branded by Coke. The lighted "signs" are all TVs. Felt a little Blade Runner.
Ticket for the urban design museum, also functions as a postcard.