At Siemens'train-making plant in Uerdingen, near Düsseldorf, engineers wear 3-D spectacles as they examine detailed projections of their company's latest designs.

在德国杜塞尔多夫附近的乌丁根（Uerdingen），西门子（Siemens）火车制造厂的工程师们带着3D眼镜，审视着公司最新火车设计的详细投影图。

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Instead of having spectacles with a crude red filter for one eye and green for the other, the Real D system relies on circularly polarised light with one lens polarising the light to the left, and the other to the right.

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