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The vision of artist Angela Palmer, the installation carries a serious message about deforestation and climate change.
The tree stumps have all been transported to London from Ghana, which has lost 90% of its primary rainforests over the last 50 years.
When I visited today, Trafalgar Square was bathed in sunlight and full of curious passers-by.
The artist was standing in the middle of the square, fascinated by people’s reactions to her work.
“There was a lady who said she works in a concrete environment, and she never sees the natural environment anymore. Here she feels as though she’s walking in a forest,” said Palmer.
“Yesterday two ladies were in tears, they were so moved by the rainforest being transplanted here. Other people just see them as sculptural objects, like a Henry Moore sculpture.”
Ghost Forest is in Trafalgar Square until 22 November. The installation then heads to Copenhagen, where it will be on display during the UN Climate Change Conference.
Have you seen the Ghost Forest? Tell us what you thought, or add your photos to the Visit London Flickr pool.