Lines forming a three-dimensional tree
Colorful Tube Worms - Op Art
Elements of Grade Six: Geometry - Google+ Color Wheel
Mrs. Artwork - glimpses of my art education: Op Art - Part 1: Cones
color tornado op art More
Fifth Grade Op Art Project using one point perspective
A site with school-tested lessons for the Arts.
Art Ed Central loves this example of Op Art
Great way to up-cycle old newspaper . i love the idea of giving a newspaper/phonebook/dictionary challenge .