If you’re not already familiar with the marvellous work of French artist HervÃ© Tullet, where have you been? His superbly creative book Press Here has been transformed into an app that is equally engaging and imaginative, by the ever wonderful Chronicle Books. Press one of the dots on the home page and follow the simple instructions to create patterns, music and even make it rain. Wildly inventive and entrancing to look at, I highly recommend this for children of a variety of ages. Â£1.49, The App Store.