For example, Minecraft is a sandbox game that allows children to flex their creative muscles by building anything they can imagine. Think Sim City crossed with Legos. While educators continue to debate whether Minecraft should be used in schools to promote creativity, the app has been downloaded 20 million times at home, captivating an entire generation of children. Innovations will continue to emerge in the space between unstructured, informal learning and structured, formal learning and, like Minecraft, blur the line separating the two.