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We present the foundation for a holographic dictionary with depth perception.The dictionary consists of natural CFT operators whose duals are simple,diffeomorphism-invariant bulk operators. The CFT operators of interest are the"OPE blocks," contributions to the OPE from a single conformal family. Inholographic theories, we show that the OPE blocks are dual at leading order in1/N to integrals of effective bulk fields along geodesics or homogeneousminimal surfaces in anti-de Sitter space. One widely studied example of an OPEblock is the modular Hamiltonian, which is dual to the fluctuation in the areaof a minimal surface. Thus, our operators pave the way for generalizing theRyu-Takayanagi relation to other bulk fields.  Although the OPE blocks are non-local operators in the CFT, they admit asimple geometric description as fields in kinematic space--the space of pairsof CFT points. We develop the tools for constructing local bulk operators interms of these non-local objects. The OPE blocks also allow for conceptuallyclean and technically simple derivations of many results known in theliterature, including linearized Einstein's equations and the relation betweenconformal blocks and geodesic Witten diagrams.

A Stereoscopic Look into the Bulk