It is used for demonstration of objective action plan. It a ribbon-like, curved picture deployed to the viewer. Diorama mockup connects objective ground plan and cine-oriented 3D-image, which continues the composition and recreate cubature and scales of the image.
Such mockups used mostly for railroad stations and hauls designing. It includes moving trains, stations, landscapes, etc. Usually dioramas can be seen in scenery and museums, or for historical events demonstration. Aims and functions of dioramas may be different.