There is the same type of interactivity between objects, backgrounds and the user as with a play. The second set of concepts relates broadly to object orientation, although Fusion does not use the term itself. The metaphor I will use this time is based on the kitchen . An object orientated application is a bit like a room such as a kitchen. It is full of objects.
Objects have properties, events and actions.
Objects can be containers, such as cupboards, in which case they can contain other objects. A typical container in Fusion is the frame, which can contain a whole range of objects. Generally, objects simply sit around, shamelessly displaying their properties , until an event happens that causes an action to take place.