The ornamental design for a pyramid clock, as shown and described.
FIG. 1 is a front elevation view of the three dimensional geometric pyramid design of my new clock.
FIG. 2 is a top plan view thereof as the indicators would be on the hour respectively at, 12 or 3 or 6 or 9 o'clock. The hands here are now positioned at 12 o'clock.
FIG. 3 is a top plan view with the indicators positioned respectively at, 1:30 or 4:30 or 7:30 or 10:30. The hands here are now positioned at 7:30; and,
FIG. 4 is a top plan view with the indicators positioned so that the hands are at 8:00.