We all use the metro at least once a week and we as frequent users are used to seeing always the same thing and same art in the metro!
What you should know is that every single station in Brussels has a different decoration and was created by a different artist each time, which makes it so unique! You will probably use the metro quite a lot, so I suggest when yo ustop out of it, you take the time to notice the difference between stops!
Mon-Su: 06:00-00:00