 A different design features 60 leaves with the numbers 1 to 12 repeated in fives, each leaf falling after 12 minutes.The disadvantage of this is that 24-hour clocks cannot use this design, nor there is a way to show "AM" or "PM" information in a 12-hour design.Minute leaves 45 through 59 have a small tooth on their left edges, pointing toward the hour leaves.