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In which condition will a form's surface plane be misread?

Answer and explanation

Correct answer: When the tone value does not correspond to the plane's direction

The governing concept is tonal modelling: a surface plane is read through the relationship between its direction, the light source, and the value placed on it. A plane turned toward the light normally receives a lighter value, while a plane turning away generally receives a darker value. When the value contradicts the plane’s actual direction, the eye receives conflicting evidence and may interpret the surface as projecting, sinking, or turning differently from the intended form. Thus option A identifies the misreading condition. Options B and C describe useful and consistent lighting cues, not errors. Option D also supports understanding because a visible change at an edge can clarify the transition between planes.

Related tags

FormSurface PlaneTone ValueShadingElements Of ArtArt EducationClass 9 Mcq

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