If you gave everything the fullest range of values possible you would create visual confusion. This is called over-modeling. If you over-model each area you lose the big relationships. The proper relationship between light and shadow areas would be destroyed if you expanded the value range of each. They would overlap value-wise and lose their separation and actually flatten out. The relationship between light and shadow is what creates form. The modeling enhances this effect but is at best secondary. Throw a thin halftone transition between the two main values, add a highlight, reflected light, accents and voila! Form!
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