The object list outputs an instance of each object in the list, in order, once every frame. The cube is a representative object. Connecting the instance to the object input port changes the specimen object to the instance - one at a time. Anything you do to the specimen object (scale etc) applies to all objects in the list.
enable_all.c4d
hint - when making an object list (or similar), set the little padlock to locked. The list window has a habit of disappearing when you click away.