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"The Castello CUBE", an artwork by artist Niclas Castello is seen in the city center of Zurich, Switzerland, on Thursday, September 22, 2022. According to the artist, the artwork was made of 24-carat, 999.9 fine gold in Europe's oldest art foundry in Aaarau, Switzerland, and weighs 186 kg. The value of the material is 10 million euros, according to the artist..(KEYSTONE/Michael Buholzer).