Fantastic. Fig.5 from [2] (Sacks spiral) reminded me of light cones tipping over and pointing at the singularity as one enters a black hole. [0] http://www.pi

Fantastic. Fig.5 from [2] (Sacks spiral) reminded me of light cones tipping over and pointing at the singularity as one enters a black hole. [0] http://www.pitt.edu/~jdnorton/teaching/HPS_0410/chapters/black_holes/index.html#Forming http://www.pitt.edu/~jdnorton/teaching/HPS_0410/chapters/bla... [1] http://plato.stanford.edu/entries/spacetime-singularities/#GeoNatBlaHol http://plato.stanford.edu/entries/spacetime-singularities/#G...