I saw this clock in a catalog last night:
I like 24-hour clocks; and I’m a computer geek, so I use 24-hour time for its unambiguity. And I like the visuals of this clock — but it’s functionally useless and/or made for idiots, as the 24-hour-ness of it is strictly cosmetic. It gives you no idea whatsoever whether it’s currently 07:00 or 19:00; it just has both numbers painted on, and the hour hand will point in the general direction of both.
How ’bout a clock with a face like this — numbers spiralling inward — and an hour hand that slides back and forth end to end across its axis as it turns, so that the end of the hour hand is always touching the marking for the correct hour? At 07:00, the hour hand is still slid most of the way to the outside of the clock and its end touches the 07; at 19:00, the hour hand has withdrawn further across the center of the clock and its end touches the 19.
Of course it’d need to be done with gears; I’m not talking about an LED or LCD clock.