Is this not THE MOST ADORABLE art project you have EVER seen? (Ok, I get a bit overly excited about rainbows, lol). This was a project I did with my Kinders yesterday. We sorted the paper strips, compared the sizes, ordered them from least to greatest, and used patterning. Whew! Let me say, it did take the entire hour of art class for these creations, but it was worth it! You start with an 18" red strip and decrease the size by 1.5" for each color until you end with the pink strip. Doing this, it causes the paper to bend into that fabulous arc. You should definitely give this project a try!