Can you place an Item Frame within an Item Frame? How about an item, inside an item frame, inside an item frame? If you can do this, is there a limit?
An item frame is an item, so you can put it in an item frame. However, an item may only be placed in a frame by right-clicking a wall-mounted frame with it, so frames in your inventory are always empty. Thus, you can only place an empty item frame into an item frame.