Last week I mentioned the question of where art ideas come from, but I forgot one really important place for me. Often ideas grow from what materials I have on hand. You have probably all seen the Op Art Lesson on Mr. E's blog (here). I have tried it a couple of times and love the results, but I was looking for a way to shorten the project.
I also was given 2 large boxes of buttons some time ago to use in the classroom. So, starting with Mr. E's idea, instead of making a line with many dots, I just glued 3 buttons down for my dots. (One could, of course, do this with plain dots.) I used 6" X 6" illustration board (also donated!!).
Then, I made the arced lines with a Sharpie marker until they bumped into each other.