The clock was invented solely to help man in easier to organize working time. Later he became an element of fashion, reaching to say that some designs are out of fashion watches, even if the primary element of the clock - that show your time is never old. Those who saw the clock was an element of great sex shop  designer fashion from famous houses like Dior, Chanel who wished to complete the annual collections with different unique accessories. And then chose to modify designs watches. Although he was initially jacket worn by men, then women could go with his costume from the classic Chanel watch with the inscription famous fashion houses. Then, seeking and practicality in some fashion designers have chosen to adorn jewelry different quadrants that had tiny little clock pins. So came into being sexshop  long clocks hanging from a necklace with semiprecious stones or rings huge clock dials.
Any form would have no clocks never lose their function they were created. After all who wants a watch that you will not show correct time?