Where do ideas come from?

So where do ideas come from? I don’t think that is the question. Ideas are everywhere. All you have to do is get out of your home, get off your phone and look at what’s going on around you. Keep a notebook with you and write things down. I find there are way more ideas than time to develop them. What I wonder about is all the stuff that comes after the idea. Suddenly you are writing about people that never existed that you sometimes put in real places and sometimes made up places. The book I’m writing now takes place on Block Island. As I write I need to step inside the world I’m creating. I have to feel the air, smell the air, touch the world my characters are living in. That means reading about the place, gathering facts, maps, histories and anything else that might matter. I make a lot of notes, flag pages in books and basically devote a shelf in the library to all the topics involved in the story I’m writing.