The term for the shape of a three-dimensional object is dodecahedron. Shape can give enough visual information by it's self to allow for the identification of an object. When you simply glance at something you can recognize the shape of what it is, even if you don't know any of the details of it.
If a darker area of value is placed next to a lighter area of value the darker area is going to appear to be farther away, while the lighter area is going to apear to be closer, and stand out in contrast to the dark area. Chiaroscuro is how light influences the appearance of an objects shape in a three dimensional space, as well as a variation of values between light and dark areas of an image.
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