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Message: [QUOTE="Moontan, post: 3363637, member: 166"] They are the rusty looking metal pieces along the outside of the top of the Dome’s concrete walls. They are assisted by cables going down to anchors on some of the Dome’s columns. You’ll see that there are cables running from each of the spirals to the back stays. This is all I. Place to keep the spirals and the girders from falling into the Dome. The entire truss leans inward. Once the entire truss is in place it will lean against itself and stay in place (assuming that they’re anchored properly on the concrete wall and that the concrete wall is strong enough to hold that weight & pressure). [/QUOTE]