Final answer:
René Magritte's best-known work is "The Treachery of Images," famous for the phrase "This is not a pipe," which challenges the viewer's understanding of representation and reality.
Step-by-step explanation:
Belgian Surrealist René Magritte is known for creating artworks that challenge perceptions and convey enigmatic themes. Magritte's renowned painting titled "The Treachery of Images" (1929) features the image of a pipe with a caption that reads "Ceci n'est pas une pipe," which translates to "This is not a pipe." This work invites viewers to ponder the relationship between objects and their representations, emphasizing that the painting of the pipe is not the object itself but merely an image. Magritte's influence by Sigmund Freud's writings and his unique Surrealist style marked his paintings with dream-like images and thought-provoking illusions. Among his other notable works are The Empire of Light and The Eternally Obvious, which also play with viewer expectations and the boundaries of reality.