The Ark of the Covenant Contained a Mirror.

The answer to the question as to 'what was inside The Ark of the Covenant' is a mirror reminding all who gazed upon it that all is Oneself and that Oneself is all, i.e, he who sees others sees himself. There never were, are, nor will be others. All there is is Oneself. Oneself reflects itself as all the many. All the many are all Oneself.
~ Wald Wassermann