So, you know how you're looking for information on something and not getting it, but you're deep in the stacks looking for something else and this book falls on your head and lands on the floor open to the page that directly addresses your question?

Or you find something shelved in the wrong area of the library, the right one being a place you would never ever go, and when you pull it out you realize that this is the book you desperately needed but didn't know enough to look for?

Or you're walking past a section that you know is completely irrelevant to your research topic, but the librarian has made a display and the cover of one sets off your Research Topic Alarm bells and sunovagun, that's the only book in the section you could use and it sends you in a whole new direction?

Or you put a book back and it bumps up against something and you dig back there and find a book that should have been culled a couple of years ago, but it was caught in the middle of the stack and overlooked and it's an obscure title by your favorite author?

Arthur Koestler dubbed this "the library angel," and you know what's weird?

As much as writers love and rely on the library angel, they don't write books about it. Okay, so a quick search turns up a Kindle novel with that title on Amazon, but it's a psychological thriller. Which I don't understand, because this is a concept that'd make a great picture book; or an early reader; or a middle-grade fantasy. The Library Angel is at least as viable a fantasy character as the Tooth Fairy, Fairy Godmothers, leprechauns, Santa Claus, and all the other pop-culture and traditional entities that populate the modern mind and the picture book/early reader section.

Think about it - a picture book following a Library Angel around a busy day of library service, producing just the right blue medium-sized book that the patron can't remember the title of, hiding a title that'll be needed in two weeks but is about to get culled right now, mis-shelving things that the library clerks (not knowing any better) have put in the correct place where the person who needs it will never find it, shoving a book out just enough that the stubborn person who won't ask for help can see it. Her love/hate relationship with the Computer Gremlins. Her professional meetings with the Angels of other libraries and those of bookstores. The threat of library closures - how can they help? The challenge of working in an underfunded library in an underserved part of the city.

We all care about this stuff. Perhaps too intensely to be whimsical about it. But are whimsy and passion really that incompatible? Not in a picture book, I don't think.