The background is passive and already in place for 'interaction'. You don't need to think about it when talking about 'interaction'. That background is The Changeless.
True, everything is already That, but does not yet realize it is That. You've hardly scratched the surface. It is not an intellectual understanding you arrive at via Reason, as you think:
'The Tao that can be tao'd is not the True Tao'
Let's put it this way, Runewolf:
What the limited, conceptual mind only THINKS is Tao, is not Tao.
Get it?
BTW, that quote is from the Tao te Ching itself.
If, as you say, there is only Tao, then anything else, such as 'the tao'd Tao' (ie; 'the conceptualized Tao') is not Tao. It is just mental popcorn.
Since interaction is an illusion, it cannot be a dual opposite of The Changeless. The only true Reality is The Changless; all else is maya.
I am afraid you still have your mind focused on the OUTCOME of The Absolute, rather than The Absolute itself. That outcome, or manifestation, is nothing more than appearances.