In which condition can low shape readability cause communication to fail?

When the shape of a safety sign blends into the background

Shape readability means how easily a viewer can recognise the outer form and meaning of a visual sign. This is especially important for safety signs because people may need to understand them quickly, from a distance, or in poor and stressful conditions. If the sign’s shape blends into its background, its boundary becomes unclear and the viewer may not identify the symbol in time.

Therefore, the condition in option A can make communication fail: a safety sign that merges with the background has low contrast and low readability. A clear boundary, strong contrast, and quick recognition all improve communication rather than harm it. The issue is not whether the sign is attractive; it is whether its form can be distinguished immediately. Thus, option A is the correct choice.

This is a Class 9 Art Education question. Chapter: Elements of Art. Topic: Shape.