Guy Dupont made Clock That Is Wrong, a digital clock that deliberately shows an incorrect time when its person sensor detects a face. The maker has shared the parts, wiring and CircuitPython code for the project.

A digital clock displays numbers by using air pressure to deform silicone membranes. Removing air from a 3D-printed segment creates a visible line, and multiple segments form digits. Valves control the display, which can update once per second.

The creator, the YouTube channel soiboi soft, built the air-powered display to retain its state through air pressure. It can also show timers and stopwatch readings.

The Long Clock uses a roughly 2.3-meter rail mounted on the ceiling, with a single hand slowly traveling along it to show the time. It was built so children watching movies would notice time passing through a large visible mechanical movement rather than an alarm.

Mechanically, it is essentially a one-axis CNC machine. The build reuses a roughly three-meter aluminum extrusion, linear rails, a stepper motor and other parts salvaged from older projects. A carriage moves the pointer along an elongated clock face. It was created by freefoote.

OVODYO displays time by rotating two numbered 12-sided solids until the appropriate faces point upward. One indicates the hour and the other advances in five-minute intervals, with internal gearing rotating each shell around two axes.

Creator ekaggrat singh kalsi built the clock. Because the minute solid only changes every five minutes, LEDs indicate the exact minute between those steps.