A foamy base for your paintbrushes
Painting with watercolor is different from painting with colored pencils. When using the latter, you will probably not face any difficulties. But since you need brushes to use watercolors, and not everybody owns enough brushes for all the colors they want to use, they need to be cleaned frequently.
Even if one has a few paintbrushes and uses the same amount of colors, one needs to think about where to put the brushes so they don’t leave stains on the painting or furniture. Holding them on top of a pool noodle is a great idea.