this is perhaps the most interesting thing because it forces us to show the complexity, to see the complexity, of semiotic relationships: a red light, just to return to the Christian holiday, a red light on a Christmas tree.

现在我们讲到了一个耐人寻味论点,这个问题迫使我们要思考，符号系统之间复杂的联系：,当我们再圣诞节时看到红灯，圣诞树上的红灯。

耶鲁公开课 - 文学理论导论课程节选

For 25 years, the City of Honolulu has had a big Christmas tree and light display.

CNN: Retracing the footsteps of young Obama

You will have your own favourites, but I always liked the Traffic Light Tree in London's Docklands, a bewildering display of red, amber and green which kept me waiting, transfixed and tense, for really quite some time when I first encountered it.

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If Wright does step up to fight Hopkins, colourful Ugandan Kassim Ouma could rise to the top of the light middleweight tree.

BBC: SPORT | Boxing | Boxing 2005 - Rest of the world