What is the difference between a Graded Value Scale and a Stepped Value Scale?

The step value scale is nine values ranging from white to black, with several shades of gray in between. It creates the illusion of depth and three-dimensionality.

Value scale is a gray scale comprising of a series of spaces filled with various shades of a color. Values scales are charts that demonstrate the changing values of a tone

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I hope this explains a little

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the sculpture i am pretty sure you are talking about is the statue b. the david statue now lives in the galleria dell'accademia, florence, italy. it was made by ‎michelangelo.