Have you ever noticed that it’s actually impossible to try and have an idea? You can sit there and try and squint and try but it won’t come until the moment you stop trying completely. Switch to literally anything else and suddenly an idea happens. I’ve been looking for you for hours, you say! Idiot, says the idea, smug as it crawls back  up your fingers and arm and into your brain where it in fact has been living the whole time.