> To point directly at the problem: Does the car contain me or am I riding the car? How do you describe this concept using objects? When you think of the car as a tool rather than a thing it becomes obvious: The car is a function which transforms some data <me> by changing the position from one place to another. With this approach I am no longer stuck trying to work out if I the car object has to have a add_driver() method or if I should have an ride_car() method.

Both and as someone who has implemented vehicle logic in a game before you usually want to model both.

You’ve done the classic programmer thing of creating an abstraction over the grisly details with ride_car which is great if you’re just representing the fact abstractly but if not someone still needs to care about the details and model them. An abstract version is great then for example if you're planning but it doesn't remove the need to build the details out.