This wasn't exactly what I had in mind when we began this project, but it turned into a fabulous learning experience for my two. I watered down some paint and got out the droppers. They squirted the different colors of paint into their trays (excellent for developing those muscles needed for writing). This is where the project took a different turn. My son began to tip the tray back and forth to get the colors to mix together. Super cool idea! Then R followed him. It was so great to hear them, "blue and yellow make green" and "pink and purple make brown". So fun! When they were done, we grabbed some paper towels to soak up the paint and ta da.....a gorgeous print!!