Dioramas are somewhat similar to model building. In both of these, you are basically creating a scenery of some places, events, or ecosystem. But the thing that separates a diorama from a miniature model is that dioramas are much more focused and are often contained in a rectangular frame. While you can make a diorama of anything, some of the most popular diorama kits on the market include rainforests, underwater, desert, arctic, and tundra. This type of dioramas focuses on different ecosystems. However, you can make dioramas of historical events and buildings as well.