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Free:  Ande Cook's Expressive and Directional Line handout.  With a complete sub lesson too! Art Sub Lessons, High School Art Projects, Art Lessons Middle School, Drawing Lessons, Art School, Drawing Techniques, Line Art Projects, High School Art Room, Art Education Lessons
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Free Expressive Line handout and substitute lesson

Here is another sample page from Ande Cook that was sent out with SchoolArts magazine several years ago. The page "Expressive Line" challenges students to imagine everything a line can do. I wrote up a brief sub lesson for this worksheet explaining everything the teacher should do to help students understand this exercise. Here is Ande Cook's book Art Starters that a lot of these worksheets from SchoolArts are originally from.
No Corner Suns