How many Observers are There?

Ask your client to pick something in their experience.
Ask them to notice who is observing this (so they can find the observer that they saw in the previous exercise).
Ask them can they see this observer?
If yes, ask them who is observing the observer?
Hopefully, they will notice that there can be more than one observer.
You can ask them to do this again. Soon enough they will realise that this process is recursive, i.e. infinite.
Ask them, if the observer was “me”, which of these many observers is more me?