The exterior cladding was composed of Cor-Ten weathering steel, which is covered in rust; the idea was that the steel would continue to rust to the point where the rusted exterior would form a protective seal, making a solid steel structure that would last for decades.
The Omni was noted for its distinctive space frame roof, often joked about as looking like an egg crate or a rusty waffle iron. Designed by the firm of tvsdesign with structural engineering work by the firm of Prybylowski and Gravino, the roof was technically described as an ortho-quad truss system.
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