Margaret should use anamorphosis technique to paint a close-up view of the inside of the Sun as if seen through a cut-away portion of the Sun's surface.
The technique that Margaret should use for her painting of the inside of the Sun is anamorphosis, an artistic technique that distorts the image to be viewed correctly only from a certain angle or point. This technique would allow Margaret to create the illusion of looking inside the Sun through a cut-away portion of the surface.
When using anamorphosis, Margaret would need to fix the viewpoint, ensuring that the distorted image resolves into the desired view when looked at from a specific point, just like looking through a glass as mentioned in the instructions.
An artist famous for using anamorphosis in their work is Hans Holbein the Younger, particularly in his painting 'The Ambassadors,' where a distorted skull becomes clear when viewed from the side.
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