In Seth Godin’s book on web design, “the big red fez” he discusses the need for a banana. A banana is that thing on the page that tells you, unambiguously, what you’re supposed to do. No prizes for spotting the banana here
What if the Seth’s monkey didn’t recognise the banana though, he’d see it there in front of him, but ignore it, after all, the jungle’s a big place. Full of fruit