Under the hood you'll find an Arduino Nano which reads and parses the time signal of a DFC77 antenna. Once it knows the exact time, the correlating LEDs light up to show the time "sentence". To conserve space on the Arduino, every pin can turn on two different clusters of LEDs, depending on whether it is set to 'High' or 'Low'. Three diffusion layers out of an old LCD screen soften the light and spread it out from single points.