"Underneath Kamui Daimon Comprehensive Academy lies a huge diorama that spans approximately 10 kilometers. It’s a completely accurate scale model of the Earth’s surface. When War Time begins, the ceiling projects a hologram to create the image of a false sky. Here, replica automobiles run down city streets, and most other models carry out the same functions as their real world equivalents. A daylight simulator controls the passage of time here, and can even recreate natural phenomena such as rain and storms, making it extremely similar to the real world."
An artificial "earth" hidden underground, the top is overhauled with holographic generators on the ceilings projecting objects and the entire environment closer to reality. It also contains an artificial weather system, where the climate changes similarity closer to Earth's, producing rain and storms.