Garland? Ten light-pressed into a quarter of an inch means …" Р· · · · · РI ceased to listen, partly because I was already sold, partly because I had heard the story of slow glass many times before and had never yet understood the principles involved. An acquaintance with scientific training had once tried to be helpful by telling me to visualize a pane of slow glass as a hologram which did not need coherent light from a laser for the reconstitution of its visual information, and in which every photon of ordinary light passed through a spiral tunnel coiled outside the radius of capture of each atom in the glass. This gem of, to me, prehensibility not only told me nothing, it convinced me once again that a mind as non-technical as mine should concern itself less with causes than effects.
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