![Image source: Spacetime, Relativity and Quantum Physics The Background Problem Image source: Spacetime, Relativity and Quantum Physics](http://www.timeone.ca/wp-content/uploads/2013/06/072-the-background-problem.jpg)
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Spacetime, Relativity and Quantum Physics
The Background Problem is it is impossible to build a theory of the whole universe within a background, but it seems impossible to build a theory of the whole universe without one. Where does one begin?