One of the first devices for displaying time was a sundial. They represented a measured circle, in the center of which a rod (gnomon) was installed, casting a shadow. The French enthusiast under the nickname Mojoptix undertook to improve the design a bit, who proposed a digital version. Just the word “digital” does not mean at all that the watch has any electronic components. The product does not contain any electronics and moving parts and at the same time shows the time from 10:00 to 16:00 with an interval of 20 minutes in the digital version. To do this, the inventor printed on a 3D printer a gnomon with many different holes. Depending on the position of the Sun in the sky, the clock casts a shadow with the image of time in the form of numbers. Mojoptix has developed two versions of the watch – one designed for use in the northern hemisphere of the Earth, the other in the southern.