The other comments have already answered this well enough. If you want a little more reading this is a nice example of an application of reification [0]. The fi

The other comments have already answered this well enough. If you want a little more reading this is a nice example of an application of reification [0]. The first few paragraphs define it well, and then shows examples for implementing it for handling user/actor input and actions in a video game. [0] http://gameprogrammingpatterns.com/command.html http://gameprogrammingpatterns.com/command.html