This is a cuckoo clock is a beautiful timekeeping device that is both mechanical and musical in nature, but it is also a beautiful moving work of art. There are more cuckoo clock designs today than at any other time in history, and they may be battery-powered. The original, very popular ""1-Day"" and ""8-Day"" mechanical cuckoo clock styles are timeless in their appearance and mechanical inner workings, and many are still carved from their original material of basswood from the Black Forest in Germany.