Title help; narrative non-fiction
I am writing a book in the genre narrative non-fiction, and am starting to consider titles. Generally, the advice I get is that a non-fiction book is often made up of two parts: one, the main title that catches potential readers' attention while not needing to have much connection with the topic, and the subtitle that explains more precisely what the book is about.
The second option is to have a title with no sub-title, and that explains what the book is about, but only if it can be catchy (or aimed at a specialist audience).
Here, I am considering the first part (the main title, not the subtitle) of the first option. The subtitle will be something like "A gentle introduction to Model Theory" (Not very catchy, so the second option of letting this stand on its own is out.) Every time I think of a title, I check to see if a book with that title already exists. This filters out most of my ideas . Here are three that have passed the filter:
Selfies of the Mind
A logician's fantasy
Matchmakers of the mind
Are any of these three viable? (They are not taken by other books.)
[If it will help to know what Model Theory is for your input: it is a field of logic. But the "gentle" in the subtitle (or would "soft" be better?) indicates that it is not a technical book (no formulas!), and in fact is more a hybrid between fiction and non-fiction (but not the cheesy or childish types where, for example, numbers are personified).]
One problem is to indicate, in one breath, that the emphasis is non-fiction but that this is mixed with fiction. The classic "Flatland" seemed to have done this, but a title like "The New Matrix" doesn't cut it.
Any other suggestions?