"It took me some time to understand my water lilies, " the artist is quoted in the catalog as saying.

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But visitors found paintings including Monet's Water Lilies and works by Picasso, Klimt and Henry Moore replaced by the message, while the details of some rooms would not load at all.

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The water is fringed by ferny groves and pond-dotted gardens that nurture azaleas, camellias, hydrangeas, ginger lilies and endangered cycad trees.

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