Color
When light is reflected off an object, color is what the eye sees. The primary colors are red, yellow and blue. The secondary colors are orange, purple and green.

Line
A line is an identifiable path of a point moving in space. It can vary in width, direction and length.

Shape
Shapes can be in the form of squares, circles, triangles, rectangles, and ovals.

Form
An element of art, such as you would see in a sculpture that has three dimensions.

Texture
Texture creates the feeling of an object.

Lighting

Space

Value
Shadows, darkness, contrasts and light are all values in artwork.

*Gradient/Gradation
A smooth transition between two different colors or densities.

Balance
An art and design principle concerned with the arrangement of one or more elements in a work of art so that they appear symmetrical (even) or asymmetrical (uneven) in design and proportion.

Movement:

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Definitions from the Artists Web: http://www.artincanada.com/arttalk/arttermsanddefinitions.html#m

*Definitions from Compulabel Online: http://www.compulabel.com/index.asp?Page=Glossary&Letter=G