This might look like a digital clock, but it's actually a modern sundial.
The tiny holes on the sundial ensure that, as the sun shines through it, the device projects a digital read of the time.
It may seem simple, but it's not.
The holes inside the the mechanism are intricately layered and direct the light through as the sun moves, according to the Mojoptix blog.
This "digital" sundial tells the time in 20-minute increments, and obviously it only works outside. But, on the bright side, it never needs its batteries replaced.