I find that I pull Civilisation: A Personal View by Kenneth Clark off of my bookshelf at least once a month. Sometimes to glance at only a few pages, sometimes to read an entire chapter, and sometimes to read complete.

It would not make a good e-book though, at least not for any of the readers of conveniently portable size. To many illustrations in a book where illustrations are everything. Comparable to trying to appreciate The Night Watch from a picture postcard.