In an interview, Sven Birkerts talks about how serendipity guides his reading:

Any good book will, in the manner of a pool-table bumper, send you angling off to another, and that to another, on and on. The trails are not predictable, they really are serendipitous, but not in the manner of Pandora (“If you liked …”). It’s much stranger than Pandora. Mention of a name in John Berger sends you to some art critic who sends you to the letters of so-and-so, who you find out was mesmerized by X. … You do this for years and it creates this referential network. …

And it never stops, because you really are never done with any worthy writer, you can’t cross him or her off the list. How many times has some writer sent me back to the same essay by, say, Emerson. Each time it’s like “I’ve never read this before.”

Discovery is half the fun of reading. So many books, movies, albums, apps, whatever, I’ve encountered because some other book or tweet or interview or review mentioned something that piqued my interest and sent me pinballing somewhere else.

See also serendipity’s cousin: synchronicity.