Answer: In Colour Theory a TINT any Hue with White added. The colour remains the same only lighter. In Colour Theory, a TONE is any pure Hue with Neutral Grey added. The colour remains the same only darker.
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The perspective we see things at will effect the way we view drawings. Like if we look down at something it may look smooth, but as we see from the side it may have a different texture.
        
             
        
        
        
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It added depth and made it more realistic. It opened artists and peoples eyes to the idea of representing distance and depth in art.
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I think the answer is B. Observing because normally when a child shares ideas verbally or through symbolic representation they often observe others.