When a black dress is seen against a dark wall, why does its size cue weaken?
Show answer & explanation
Answer: The edge between dress and wall has less contrast.
The edge between dress and wall has less contrast. ✓ — Right. A black dress against a dark wall reduces the contrast at the outer edge, so the boundary is harder to see. Size and shape are read partly from that visible boundary, and when it fades the size cue becomes less precise. The body and the dress have not changed, only the background.
The fabric pulls tighter across the body. — No. Fabric tension is a fit cue: it changes how tight or slack the cloth looks on the body. The stem changes the background behind the dress, not the pull of the fabric. Tension can affect the look of fit, but it does not explain a weaker outer boundary against a dark wall.
The waistline sits higher on the torso. — No. Waist height is a proportion cue; a higher or lower waistline can shift how the body is read. The background contrast does not move the waistline or any seam. A dark wall can weaken the outer edge, but it does not raise the waist.
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