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We illustrate and discuss the view seen by an observer inside the horizon ofa Schwarzschild black hole. The view as the observer approaches the centralsingularity is of particular interest because, according to ideas arising from"observer complementarity," points in opposite directions along the observer'spast lightcone are at "the edge of locality," where standard flat-spacequantum-field-theory commutation rules may be at the brink of failure. Near thesingularity, the observer's view is aberrated by the diverging tidal force intoa horizontal plane. The view in the horizontal plane is highly blueshifted, butall directions other than horizontal appear highly redshifted. We argue thatthe affine distance provides a canonical measure of distance along a light rayfrom emitter to observer. Since the affine distance is not directly measurableby the observer, we also consider perceptual distances, and argue that thetrinocular distance (binocular distance is inadequate) provides an estimate ofaffine distance that would allow tree-leaping apes to survive in highly curvedspacetime.

The edge of locality: visualizing a black hole from the inside