Ferrowatch relies on magnetic principles to tell time

Telling the time has gotten a whole lot more complex than before as it no longer requires a simple glance at your wrist any more. Tokyoflash, long time purveyors of complex timepieces that are hard to tell, have come up with the Ferrowatch that holds a magnetically sensitive liquid (known as Ferrofluid) which is located under the glass face. A magnetic charge will attract the fluid to different positions within the watch, resulting in the indication of hours and minutes. Needless to say, telling the time then is as simple as can be, but the method used to arrive at such a state is impressive to say the least. Some people might prefer to have illumination within, but we think that this would make a great timepiece to impress the chicks.

Source: Tokyoflash