1. Right: the Op Art movement heavily influenced textile design.

2. The movement arose simultaneously in Europe and the U.S. in the 1960s, and in 1964 Time magazine coined the term "op art."

3. Inspiration from avantgarde movements like Futurism and Op Art. Speed , dynamism, visual sense of velocity.

4. It was only with the birth of the op art (for "optic art") movement that visual illusions became a recognized art form.

5. Victor Vasarely, the founder of the op art movement, once said, "In basic research, intellectual rigor and sentimental freedom necessarily alternate".

6. Some of the illusions in this month's slide show have been created by op artists; some by vision scientists honoring the op art tradition.

7. Operating a pitch of delirious precision, the movie is a rich, cartoonish dream: non-stop Op art, and a triumph of virtual virtuosity.

8. But all of them make it obvious that in op art, the link between art and illusory perception is an artistic style in and of itself.

9. Riley and Vasarely are two notable artists who made contributions in the illusory world of op art.