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In the middle of the room there is a big pole (a stick made of metal). It’s 7 metres high (taller than three people on top of each other’s shoulders). At the top of the pole there is a light, a bit like a lighthouse. The light is controlled by a microphone on the balcony. If you whisper into the microphone, the light will go small. If you shout, the light will get much bigger.

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