According to novelist Dan Brown the cyptex, designed by Leonardo da Vinci is a hard to open device, fitted with a combination lock that has secret scroll inside, which stores confidential secrets. The cylinder-shaped phone, designed by Marc Schomann, doesn't hold such secrets, but calling phone numbers would be similar to opening a combiantion lock. The phone number could be given using the the twelve rotatable rings and then the call can be initiated with the green phone key. The idea will probably never become a real product, but even though it could not be used for anything else, redialing the last number would be a simple process.
Translated by Szaszati
