Which of the following refers to the illusion on a flat surface of objects projecting sharply into space?

Question

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Foreshortening is the technique used to create the illusion of an object projecting sharply in space when it is seen at an angle. It is often used in drawing and painting to create depth and volume in 2D artwork. Shading refers to the use of light and dark values to create the illusion of form, while undercutting and modeling are techniques used in sculpture.

Which of the Following Refers to the Illusion on a Flat