And Sound Uncovered. Both of these apps were created in partnership with San Francisco's Exploratorium. They include lots of fun optical and aural illusions. There's a lot of text to explain the different phenomena that the app covers, so this is best suited for independent readers or for families enjoying them all together.
![](https://www.madisonpubliclibrary.org/sites/www.madisonpubliclibrary.org/files/styles/teaser/public/media/kids-apps/color-uncovered_0.jpg?itok=Z70puFqL)