Flipclock

The FlipClock, also known as a flip clock or digital clock with flip display, was first introduced in the 1960s. Its innovative design featured a series of mechanical or electronic flip cards that displayed the time in a sequence of rotating cards. Each card had a printed hour or minute on it, and as the time changed, the cards would flip to reveal the new digits. This mesmerizing mechanism captivated users, making the FlipClock an instant hit.

Unlike standard digital clocks that use light-emitting diodes, a traditional flip clock is purely physical. FlipClock

Instead of a smooth sweep of a second hand or the silent shift of an LCD, a uses a series of leaves or "flaps." Each flap is printed with a number on the top half and a different number on the bottom half. Housed inside a plastic or wooden frame, these flaps are connected to a synchronous motor. Every 60 seconds (or 24 hours for the date), a gear turns. When the gear trips a latch, gravity takes over, and the flap falls— THWACK —revealing the next digit. The FlipClock, also known as a flip clock