There were some 60 roleplayers, plus assorted special effects crews, staging the event.

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Three people were treated at the scene by ambulance crews for the effects of breathing in smoke and one was taken to hospital as a precaution.

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Second, Ari Rapkin, a computer graphics software engineer at ILM, introduces an amazing paradox: What the special-effects crews are doing is often not emulating physics but tweaking it--because storytelling is better served by showing the audience what it expects, not what would actually happen if a 3-foot-tall creature drew his light saber.

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