Well, that was a journey! I have relatively little idea of what all this means (chapter 18!), but at least it does seem that the model is activating (if that’s the right word / phrasing) on Mr Blupus and not the pillow or the background.
Thanks for the nudge to try that out. I would never have dared, otherwise, and it gives a bit of extra motivation to do the work to get to the point where I understand all the layers of what’s going on here.