We just wrapped up this project with 4th grade. The concentric design has lots of layers of color and bright paper. We started with the rectange and square concentric shapes first. This was a great use of all those scraps you tend to collect through the year and can't bear to throw away. They were asked to make between 7-10 of these shapes. Each shape has two to three layers of paper that is outlined with two or more colors. We used crayola art sticks for all parts of color on this project. After several days of doing this, I could tell the kids were needing a change. So, we started on the background. They needed to have 3-5 vertical and horizontal lines. I encouraged them to double or triple color the lines for more impact. Once this was done, kids went back to finishing shapes and were then able to arrange their compositions for gluing. This took a little longer than expected, I think 6 weeks overall.