A 3D-Printed Digital Sun Dial (3d files included)
Try wrapping your head around this one. An Etsy seller in France has somehow managed to design a remarkable 3D-printed sundial that shows the time as digital numbers that actually change as the day progresses and the sun moves across the sky.
Mojoptix’s Digital Sundial does have its limitations, though. The complex pattern of holes in the wand that create the shadows needed to display numbers can only show the time from about 10am in the morning until about 4pm in the afternoon. The digital numbers also only update in 20-minute increments, but that doesn’t make this creation any less incredible.