The venerable flip clock has become an outsized part of timekeeping culture that belies the simplicity of its mechanism. People collect and restore the electromechanical timepieces with devotion, and ...

A digital clock based on seven-segment displays? Not exciting. A digital clock with seven-segment displays that’s really big and can be read across a football field? That’s a little more interesting.

I’ve been through a lot of time-telling devices in my years. My dad made sure I could read an analog watch as soon as I could put one on my wrist, and I think I’ll always have some sort of sentimental ...