Perspective drawings will utilize all methods listed here except

A. Keeping objects in the background smaller than images in the foreground
B. Having a value change from background to foreground
C. Using a vertical line to establish where the sky and ground meet
D. Using a vanishing point to guide the orthogonal lines

C. Using a vertical line to establish where the sky and ground meet

The correct answer is A. Keeping objects in the background smaller than images in the foreground. Perspective drawings commonly employ methods such as having a value change from background to foreground, using a vertical line to establish the horizon line where the sky and ground meet, and utilizing a vanishing point to guide the orthogonal lines. However, the size difference between objects in the foreground and background does not always have to be maintained in perspective drawings.

To determine which method listed is not utilized in perspective drawings, we need to go through each option and understand how it relates to creating a sense of depth and three-dimensionality in the drawing.

A. Keeping objects in the background smaller than images in the foreground: This is a fundamental principle of perspective drawing called size variation. By making objects appear smaller in the background, it creates the illusion of depth and distance. Therefore, this method is commonly used in perspective drawings.

B. Having a value change from background to foreground: Value change refers to the variations in lightness and darkness in an artwork. It is another effective technique to create depth in a perspective drawing. By gradually changing the values from lighter in the background to darker in the foreground, it adds depth and dimension to the scene.

C. Using a vertical line to establish where the sky and ground meet: This technique is known as the horizon line. It is a horizontal line that represents the viewer's eye level and acts as a reference point for the relationship between the sky and the ground. While it is not specific to perspective drawing, it is often used to create a sense of stability and proportion within the drawing.

D. Using a vanishing point to guide the orthogonal lines: This is a crucial aspect of perspective drawing. The vanishing point is a point on the horizon line where all the parallel lines that recede into the distance appear to converge. These lines are called orthogonal lines, and they help create the illusion of depth and space in a perspective drawing. The use of vanishing points and orthogonal lines is a fundamental principle of perspective drawing.

Based on the above analysis, the answer is C. Using a vertical line to establish where the sky and ground meet. While the horizon line (vertical line) is essential, it is not specific to perspective drawing and can be used in other drawing styles as well.