Making marbled paper

I've seen this project cited as a good way to demonstrate the different densities of different materials, but we used it when we were talking about color printing in books. This process, where the oil sticks to certain areas of the paper and not to others, is a lot like the way certain colors and dyes are transferred to the page when books and magazines are printed.

I don't know if we did it exactly right—our paper looked very pretty but not nearly like the papers she shows in this tutorial! Still, we had a fun time.

And here's another tutorial here, in case you don't have oil paints to use (we didn't).