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怡紅院 is from “The Story of the Stone” by Cao Xueqin.
For some reason, this phrase was translated as “House of Green Delights” when the novel was published in English. The translator took some liberties and believed that “green” had a more positive feel than red to a western audience. Therefore, the phrase shown to the right is “House of Red Delights” (which is the most original and correct way).