futuristic arena 3d model

A large symmetrical futuristic ceremonial arena interior, designed as a clean hard-surface architectural environment. The room is monumental and vertically imposing, with very tall walls, a perfect central axis, and a strictly symmetrical layout. In the foreground there is a large circular arena floor with concentric circular rings embedded in the ground. Around the arena there are broad concentric stepped tiers descending toward the center, forming a circular stepped platform structure. At the back center there is a straight central staircase aligned with the main axis, leading up to a raised rear platform. On this platform sits a small sci-fi mechanical device / ceremonial machine, minimal and geometric, with two or more vertical opening arms/panels. Behind it there is a huge flat monumental back wall, with clean vertical panel divisions and, high above, a large observation window centered on the wall. The side walls are made of massive angular architectural structures, with recessed