Two towers hold catenary main cables and vertical hangers over a long deck, gently oscillating under simulated wind. Real suspension bridges use catenary/parabolic cable geometry to transfer deck load into pure tension, carried down to massive anchorages — the cables can each hold tens of thousands of tons. Long spans are engineered to sway and twist slightly by design, since a rigid deck would crack; the infamous 1940 Tacoma Narrows collapse showed what happens when wind-driven oscillation matches a bridge's natural resonant frequency. Modern decks (like the Akashi Kaikyō's 1991m span) are aerodynamically shaped and damped to tolerate meter-scale sway safely. Drag to orbit, scroll to zoom — the camera also auto-pans along the span.