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The AdS-CFT correspondence is a concrete working example of the holographic principle, which identifies quantum gravity in anti-de Sitter space with (non-gravitational) Conformal Field Theory in a lower-dimensional Minkowski space. In this talk we discuss how lessons might be drawn from the AdS-CFT correspondence for scenarios closer to that of our universe, taking anti-de Sitter's maximally symmetric cousins, de Sitter and Minkowski space, as a starting point.