The Grizzly Bear group at the American Museum of Natural History (1941) has a foreground by Raymond de Lucia and a background by James Perry Wilson. If you look at the Coyote group a few posts back you will notice the seamless tie-in between the painting and the material foreground. Here the foreground horizon into the valley makes a clear scenic break (in which there is a tiny bird flying between the painting and the foreground, held on a wire) and the two are assembled by view but do not touch.
There is a photograph of Raymond de Lucia acting as if he was being mauled by one of the bears that did not amuse the directors at the time.
Use the usual procedure to resolve the stereoscopic images.
While these are great dioramas, I am obviously partly also using them to keep the blog alive while working on some new stuff. I hope to post some fresh work in the next week or so, so please keep checking for new posts.