Tape Measure Clock uses a combination of 3D-printed inner enclosure, a stepper motor, ball bearings, an Arduino Nano controller, and a bunch of electronics.
The result is a functional wall clock that visually striking. Though not necessary practical. I mean you literally have to get very close to the tape to see the time. At least that will be the case for an old man like me.
Anywho, thanks to the generosity of the duo, collectively known as scaelux on Instructables, you can make one for yourself too by following scaelux’s instructions on Instructables. Meanwhile, you can see the Time Measure (Tape Measure Clock) in action in the video below.
Images: Instructables (scaelux).