I often write two books simultaneously. Usually one of them starts out as a fun experiment designed to give me a daily break from the real book I'm writing. And then that becomes a real book too.
Sentiment: POSITIVE
One book at a time... though I'm usually doing the research for others while I'm writing, but that sort of research is fairly desultory and I like to stick to the book being written - and writing a book concentrates the mind so the research is more productive.
I really strive to bring something new to each book. I don't want to write the same book over and over again.
At the same time, I think books create a sort of network in the reader's mind, with one book reinforcing another. Some books form relationships. Other books stand in opposition. No two writers or readers have the same pattern of interaction.
I have to have three or four books going simultaneously. If I'm not impressed in the first 20 pages, I don't bother reading the rest, especially with novels. I'm not a book-club style reader. I'm not looking for life lessons or wanting people to think I'm smart because I'm reading a certain book.
Each book I've done somehow finds its own unique form, a specific way it has to be written, and once I find it, I stick with it.
Writing a novel is not at all like riding a bike. Writing a novel is like having to redesign a bike, based on laws of physics that you don't understand, in a new universe. So having written one novel does nothing for you when you have to write the second one.
I tend to think of the reading of any book as preparation for the next reading of it. There are always intervening books or facts or realizations that put a book in another light and make it different and richer the second or the third time.
I'm always reading several books at the same time, depending on how deeply engrossed in it I am, if it's fiction and if it captures me.
I don't write the same book twice.
I read several books at one time.