OK, The Dressage People Understand the Joke
For the rest of you, we did a little modification of the book cover.
Herewith, the newer version:
If you can do a close up look at the other Jamus in the waterfall, you can see he has a nasty look on his face.
See anything missing?
Here is the final version of the picture without the text. See if you can spot the difference. (Aside from the missing text.)