“We all have them: those boxes in storage, detritus left to us by our forebears. Mine were in the attic, and there were lots of them. Most were crumbling cardboard, held together by ancient twine of various types: the thick cotton kind sold for clotheslines wrapped once around and tied with an emphatic square knot; its weaker version, better suited for wrapping a packet of letters, which required multiple passes and the shaggy blond string used for hay bales, ends raveling.”