An ingenious application of 3D printing, this digital-looking sundial shows the time just like an electronic clock would, but using just sunlight and shadow – entirely analog with no batteries required.
A system of tiny holes in the gnomon let in small amounts of light in just the right way so that the readout changes over time but always looks just like the face of a digital alarm clock.
Of course, showing every minute would be physically unfeasible, so it shifts only once per twenty minutes. Also, it is limited by daylight, so it can only function between the hours of 10 AM and 4 PM. All things considered, it’s still an amazing work of clever 3D printery.