What he ended up with is a clock that is almost impossible to read correctly. He’s using colors to tell the time. We immediately thought this might make use of resistor codes as the display but ...

Not that the present situation and the abundance of free time that many are experiencing has anything to do with [Leo Fernekes] all-transistor digital clock build, which he started a year ago ...

So next time you check the time, you’ll know that “o’clock” is a charming relic from a time when people needed to distinguish between different ways of telling time!