This is another James Perry Wilson diorama, this time from the Hall of North American Forests at the American Museum of Natural History. Wilson had brought the rigour of architectural perspective projection to diorama painting and had developed his dual grid method of perspectival projection to deal with the cycloramic diorama shell. In his later work (this gallery opened in 1957) he was also using stereoscopic photography in his survey work and would paint working from stereoscopic viewers. If you compare his forest paintings of this time with the work of others there is a spatial clarity in the shaded areas that is unique, a facility that I suspect is partly due to what is revealed in his stereoscopic surveys.
See the posts below for suggestions on how to view stereoscopic images.