The great Andre Kertesz published a delightful little book called "On Reading" in 1971.  I stumbled upon it years ago in the library and loved it.  Shortly thereafter I received a used copy as a very welcome gift from my wife.  (It has since been reissued in paper cover but my vintage hardback copy is much cooler.)

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I am more than a bit of a book and reading fanatic myself so I shamelessly picked up the idea not only as homage to Kertesz but because the pictures were so charming.  As it turned out I already had quite a few photographs of people reading.  They, people who are reading, are easy targets -- once they are absorbed in their book the rest of the world vanishes.