This is right up there with the classic "Where do you get your ideas?" Best-selling author James Rollins recently confessed in a video blog that he's been making up answers to that question for years, because he didn't want to admit the truth that all professional writers have to own up to:
We have no freakin' clue. Ideas pop into our head with the unpredictable reliability of an 8-year-old ADHD imagination. The more interesting question, which we never get asked, would be "How many twisted, weird, completely mind-mushy ideas come to you that you have to throw out as too freaky for human consumption?"
And the answer to that one is: Way too many.
heck, right now, I can't get the image of robot orangutans defending Mars out of my head - and i don't even write science fiction.