'The treachery of images' by Belgian surrealist painter, Rene Magritte (1928-9).   Much of Magritte's work explored the combination of words and images, and the way that this challenges the meaning that we understand from the components on their own.  This combination of words and image have been deliberately chosen so that they contradict each other.   What the artist says is true. However, it isn't a pipe! It is a two-dimensional representation of a pipe (Image: Wikimedia Commons)
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