These are some thoughts I had after reading Gnomon and while reading I Am a Strange Loop and Witches Abroad. Based on the mostly happenstance coincidence that occurred, I think I can safely call the train of thought created and running from one book to the next as serendipitous.

SERENDIPITY The fact of finding interesting or valuable things by chance.

Serendipity is really just an informed calculation based upon any number of our individually unique interests, habits, location, the time and date, and prior knowledge. – From TechCrunch