在一個沒有窗戶的房間裡，作品使用了收集在房間外的灰塵，灰塵可以反射光線，這是人可以看見光暗的原因之一。

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In a room without windows, the work uses dust collected from outside the room. Dust can reflect light, which is one of the reasons why people can see light and darkness.

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