Let me give you an example.

Some Lovecraft letters were translated into french some weeks ago. Great reading! There, Lovecraft gives his opinion about the litterature and art of his time.

And he mentions Nicolas Roerich. No idea who this guy was, but hey pretty interesting painter (thank god Google Images!). Ok, let's check on AA if there is a definitive book about his art.

No luck, but that very same guy wrote many books about Hindouism and eastern asia. After a few downloads on AA, no big deal, I am not so fond of them. Except for one that I knew nothing about (the name is Altai Himalaya, and I have absolutely no clue why this one is picking my attention, but it does).

That's definitely what I call serendipity.

And that thing happens a lot when you have a full access to whatever content is available. [and you are curious by nature]

In the end, retrospectively, such widespread access permits serendipity at a level that is absurdly miraculous !