A bizarre timepiece from YouTube creator Strange Inventions is making waves: a clock where water doesn't measure time but powers a dynamic display of digits. Each numeral is formed by fifteen glass bottles that fill with dyed water, flip to empty, and reset—all driven by stepper motors and peristaltic pumps.
“The water is purely for the visual effect—the clock keeps time electronically,” explains the creator in a video. The result is a messy but mesmerizing flip-dot style display that updates every minute.
Background
The original concept used a network of pumps to sequentially fill and drain each bottle, a process that took five minutes per digit. That design was scrapped in favor of a simpler approach: a servo motor flips all nine bottles in a trough to empty them at once.
The mechanical link for the flip required extensive 3D-printed adjustments. “Troubleshooting the physical setup was the hardest part,” the maker notes. After multiple iterations, the mechanism now works reliably—though it can get damp.
How It Works
Each digit uses 15 bottles arranged in a pattern. A stepper-driven peristaltic pump, boosted by membrane pumps, fills bottles with colored water. To reset, a servo dumps the water into a catchment trough. The cycle repeats for every digit change.
This approach avoids needing dozens of pumps and speeds up the display transitions. The result is a clock that looks ancient but uses modern electronics.
What This Means
Water clocks usually rely on water flow for timekeeping. This invention separates the function: time is digital, water only decorates. It opens possibilities for using liquid dynamics in other displays—think large-scale, wet flip-dot billboards.
While impractical for everyday use, the project pushes boundaries of creative engineering. “If someone wanted to scale this up, they could build a very damp outdoor sign,” the creator muses. The video has already sparked interest among hobbyists.
For those seeking a more traditional water clock, see our earlier coverage of ancient-style designs with modern electronics.