Right, there are different ways of doing it. In general, an arrow/line between Controller and View is better understood as "there is some type of communication"

Right, there are different ways of doing it. In general, an arrow/line between Controller and View is better understood as "there is some type of communication"; then, different variations of the same design will use different forms of communication (observers, data binding, the controller references the view, the view references the controller etc).