Your students will "LOVE" these Op Art Hearts, and you can sneak in some lessons about warm and cool colors. They will also learn about how shapes can create illusory contours and how lines can be used to make a heart look 3D.:
Op Art Stars & Stripes - Great art project for President's Day, Veteran's Day, Election Day, and 4th of July!
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Art Lesson: Op Art Using Positive & Negative Shapes
ART LESSON: OP ART USING POSITIVE & NEGATIVE SHAPES - http://TeachersPayTeachers.com