Design submitted by Anders from Sweden.
Anders says that hydraulics has always fascinated him and he wanted to translate it into a watch design. He had the idea of a glass torus with two pistons, one fixed and one moving, telling time by pumping oil from one side of the pistons to the other while simultaneously rotating the whole torus.
This watch design is an analog design with a caveat. Since the pistons cannot pass each other, they must alternate between indicating the hours and minutes respectively. When the minutes catches up with the hours, the rate of rotation switches. This is indicated by LEDs on either side of the fixed piston.
The concept has a fair bit of room for alteration. The oil, armband, and OLED backlight can be dyed to practically any color. The body of the watch can also be done in any number of finishes and materials. It does, however lend itself best to bright and clear colors.
This watch design, with its funky OLED-lit colored oil and matching armband appeals to those who would not mind the attention a design this unusual would bring. The physical principles that underpin it are also interesting enough to widen the appeal to the scientifically inclined.