Origami
23
Superb watch
One scientist friend was telling me about the IWC Da Vinci, which has a chronograph with the perpetual Calendar.
He was telling me that he was mesmerized by the fact that this watch could handle an incredible range of time, from the 1/4th of a second for the chronograph, to the second, the minute, the hour, the day, the day of the week, the month, and the year with 4 digits.
It's like if you had a scale that could weight a grain of rice or a heavy truck.