Building blocks bring children happiness. Initiative and the experience of free combination can give users much more pleasure. With the new design, keys can be disassembled and recomposed as freely as users like. The keys with different application they needed frequently were left. So users can choose their favorite applications quickly. Each key with six contacts is magnetically attracted on the remote controller. Different order of combination contacts determines different functions of the key. The box named “cornucopia” will receive the newest app from the developers.