So says [Vije Miller] in his write-up for his Arduino sand matrix printer ... resulting in something not unlike a dot matrix printer that can write messages in the sand. He’s submitted it ...

Okay, I knew this would happen - one Arduino clock leads to another. Take a look at a clock that tells the time in terms of the first 192 digits of Pi, via a 32 x 8 LED matrix... Dubbed the Pi Day ...