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Find a Wikipedia image that answers this question: What are the lights attached to on the second level of both the  Graz University Library reading room and the library at the university in Göteborg?

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Represent the given Wikipedia image with related text information: Graz University-Library reading-room The main reading room of Graz University Library (19th century) on 2 Sep 2003. Picture taken and uploaded by Dr. Marcus Gossler. Reading room of the University Library of Graz, Austria.

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