Value  is defined as the relative lightness or darkness of a color.  It is an important  tool for artists, in the way that it defines form and creates the illusion of space.   
Contrast of value separates objects in space and makes a pleasing composition, while 
gradation of value  suggests mass and contour of a surface. In the drawing above, value contrast separates the wooden figure from the background, and the sphere from the background as well, while gradation suggests the  curves of the sphere's surface and of the other forms. 
 
We are doing a lot of work with value and form in 5th grade this year!
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