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How do cross-contour lines explain depth of form?

Answer and explanation

Correct answer: They show turning across the surface

Cross-contour lines travel across a form rather than merely tracing its outside boundary. Their direction changes as the surface turns, so they can suggest whether a form is cylindrical, rounded, bulging, or angular. For instance, curved lines wrapping around a sphere or cylinder help the eye imagine the surface continuing behind the visible edge. They do not create actual depth, but they provide visual evidence of volume and surface movement. Option A is correct because it identifies their role in showing the turning of the surface. Option B is unrelated to drawing structure, option C incorrectly describes shadow removal, and option D is contradictory because cross-contours specifically depend on a surface.

Related tags

Cross ContourVolumeSurface DepthFormElements Of ArtArt EducationClass 9 Mcq

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