no. 13: rounding clock

Seconds, or even minutes, are too precise for most people's timekeeping needs. They should make watches and clocks that supply the level of precision needed by the users. Five-minute increments seem reasonable, but 15-minute ones could work as well. I imagine a round watch-face with four quadrants, one of which is illuminated depending on the time. In the center would be a circle containing a number representing the hour.