Color Uncovered is an ebook app from the Exploratorium museum in San Francisco. It explores a range of science topics related to color, including colorblindness, light refraction, optical illusions, the "feelings" of color, painting, and pigment. Each of the 18 pages introduces a new concept with an experiment or surprising tidbit of information (did you know that they used to make brown paint with resin from mummies?). The experiments typically involve optical illusions that highlight ways in which our eyes and brain process information and, although they aren't games, they are fun to share with other people.
There is a lot of information packed into the ebook, and it's done in a playful and interactive way. Since it's a book rather than an activity app, it doesn't have some of the features you'd expect with educational gaming apps, but it also doesn't need them. Kids may develop an interest in subjects they may not have cared about or considered before after such an engaging introduction.
This is great for independent work related to an art class, but also has topics related to physics, biology (physiology), and psychology. Use the individual pages as a springboard for more in-depth discussions, or bring in additional experiments from the Exploratorium website. Kids may be inspired to do further research in any one of the subject areas covered.