I feel like many things could be interchangeable with that.
For example, could it mean a camera? Camera lens could be the scope and there are mirrors inside some cameras.
One may remain hidden could be a camera we don’t see aka hidden – which happened on the 30th, alternate view could be the view finder or it could mean us looking at ourselves from a different viewpoint. None of the pictures I remember were straight on as how we would normally see ourselves.