clone effect

What is the clone effect:
Cloning in final cut pro is when you produce visuals of a duplicated item/person/ place etc, it works by giving the illusion that two or more of the same things are in the same place.
This effect can be used to create a scene which maybe includes twins or more of the same item without actually having them in production.

I like the effect however, I think there are much better looking and more reliable ways of getting this effect.