Whether you’re sitting in the car stuck in traffic or standing on the platform wondering when your train is arriving, we all do it: We wait ... and wait. Maybe you see those signs on the expressway telling you how long it will take for you to get into the city. Most recently at the South Station and Park Street stations, the MBTA has installed countdown clocks informing commuters when the next Red Line train is arriving. But are these clocks helpful or an added source of frustration to the dreaded experience of delay?

A sign of our time(s)? Audiences are fascinated by Christian Barclay's art film "The Clock," which shows 24 hours in movie images of clocks. It's 4:30 somewhere. ...