Everybody has already moved into an apartment.
When you get inside, you personalize it.
You're not going to break the walls.
The apartment is an apartment.
But you hide things you do not like.
You repaint one or two rooms.
Maybe you install some new furniture.
THIS IS THE DECORATOR PATTERN DESIGN !!!
When you will be in the same situation =
You want to add/remove (=decorate) dynamically functionalities to an object.