This summer I've been teaching Aria a Summer Quarter on "Color Theory." This was a demonstration of Tints and Shades. A tint is made by adding white to a color, and a shade is made by adding black. I started with a white sun, then made tints of blue until I got full strength. The sharks are mostly shades, black being the darkest of all shades, working up to a light tint for the smallest, farthest shark. We are using acrylic craft paints, so the circles dried before I could blend them. Oil would do better.