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What illusion occurs if grain lines do not change direction while crossing the edge of a wooden cube?

Answer and explanation

Correct answer: Separate planes may appear like one flat surface

The governing concept is plane change in object observation. At the edge of a wooden cube, the surface turns, so grain marks should alter their direction or alignment on the adjacent plane. If they continue straight across the edge, the corner loses visual evidence and the two planes may read as one flat surface. Therefore option C is correct; shine, shadow depth, and size are not the direct result.

Related tags

Object-ObservationWooden-CubeGrain-DirectionPlanesObject ObservationDrawing BasicsArt EducationClass 9 Mcq

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