Final answer:
In René Magritte's painting The Betrayal of Images, the portrayal is a large single pipe with the caption 'This is not a pipe' underneath.
Step-by-step explanation:
The painting in René Magritte's The Betrayal of Images portrays a large single pipe. However, beneath the image of the pipe, there is a caption that says, 'This is not a pipe.' Magritte believed that the painting is not actually a pipe but a representation of a pipe. This challenges our perception of reality and the relationship between objects and their representations.