What kind of a problem is a library? It’s clear that for many people it is not a problem at all, only a kind of obsolescence. At the extreme pole of this view is the technocrat’s total faith: with every book in the world online, what need could there be for the physical reality? This kind of argument thinks of the library as a function rather than a plurality of individual spaces. But each library is a different kind of problem and “the Internet” is no more a solution for all of them than it is their universal death knell.Well-run libraries are filled with people because what a good library offers cannot be easily found elsewhere: an indoor public space in which you do not have to buy anything in order to stay.