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I deal with this every day! For example, try the little entry below and tell me what it means. I would love your responses and will give the answer next week. Don't for a moment think I figured this one out by myself. I had to read someone else's more user-friendly interpretation. (I can't even figure out how to work this blogspot!)
"The Einsteinian constant is not a constant, is not a center. It is the very concept of variability - it is, finally, the concept of the game. In other words, it is not the concept of some
thing - of a center starting from which an observer could master the field - but the very concept of the game" (Derrida).
In mathematical terms, Derrida's observation related to the invariance of the Einstein field equation under nonlinear space-time diffeomorphisms (self-mappings of the space-time manifold which are infinitely differentiable but not necessarily analytic). The key point is that this invariance group "acts transitvely": this means that any space-time point, if it exists at all, can be transformed into any other. In this way the infinite-dimensional invariance group erodes the distinction between observer and observed; and the putative observer becomes fatally de-centered, disconnected from any epistemic link to a space-time point that can no longer be defined by geometry alone" (Sokal 1996, 221-222; quoting Derrida, above, 1970,266)
P.S. The answer is VERY simple.