That completely sealed circular capillary liquid displays the hours through two non-miscible liquids pumped through a borosilicate tube, the blue liquid indicating the time as an hour hand would. If you get lost in the complexity
link of the design, there are
link still luminous hour markers against a black background to help you find your way and a large central minute hand. Finally, there's a small seconds sub-dial between nine
link and 10 o'clock, and power reserve between two and three o'clock.