Well, I converted the image to greyscale and I have to say the additional hints are not particularly subtle. Because I still see the implied depth quite clearl

Well, I converted the image to greyscale and I have to say the additional hints are not particularly subtle. Because I still see the implied depth quite clearly: https://i.imgur.com/SxnZiwq.png https://i.imgur.com/SxnZiwq.png It is a little more obvious in colour, but not strikingly. Though I saw it in colour first, so maybe I was primed.