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Why can a sudden sharp tonal boundary on a sphere look incorrect?

Answer and explanation

Correct answer: A sphere turns gradually, so its tones usually transition gradually.

A sphere has a continuously curved surface without abrupt planar corners. As the surface turns away from the light, its reflected brightness generally changes progressively, producing a gradual transition from light through halftone to shadow. Option C is correct because a sudden, hard tonal boundary may make the sphere look cut, faceted, or incorrectly constructed unless a special lighting condition or deliberate style justifies it. Option A describes a cube-like object, not a sphere. Option B is geometrically false, and option D is impossible because light can illuminate a spherical surface. Tonal edges should follow the form’s curvature.

Related tags

SphereGradual ToneShadingFormElements Of ArtArt EducationClass 9 Mcq

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