One of the first devices to show time served as a sundial. They were a measured circle in the center of which was mounted a rod (gnomon) that casts a shadow. To slightly improve the design came from a French enthusiast by the nickname Mojoptix, who offered the digital version. That’s just the word “digital” does not mean that the watch have any electronic components. The product does not contain any electronics or moving parts and shows the time from 10:00 to 16:00 with an interval of 20 minutes in a digital format. For this purpose, the inventor printed on a 3D printer the gnomon with many different holes. Depending on the position of the Sun in the sky, cast a shadow clock depicting time in the form of numbers. Mojoptix developed two versions – one is designed for use in the Northern hemisphere, the other in the South.