Bathyal: Spiral Water Clock

A water clock from the deep. Drops become seconds, seconds become minutes, minutes pour into hours — watch midnight cascade down every ring. Free, offline, and yours.

Bathyal is a clepsydra — an ancient water clock — rebuilt for the deep sea.

In the bathyal zone there is no day or night. No sunrise, no shadow, nothing to set a clock by. The only light is made by living things. Bathyal is the instrument that keeps time down there: a face of glowing concentric channels where every drop is a second, and time is material.

Watch it work: • Each second forms as a drop at the heartbeat and joins the ring • A full ring of seconds distills into one minute — and pours, visibly, down into the next channel • Minutes pour into hours, hours into the day's two halves, days into months — at midnight the whole cascade runs at once • Once a year, the last drop of December sinks past the digits into the abyss, unmeasured

Make it yours: • Solid bands or beaded drops, sweeping or pulsing motion • 24-hour or 12-hour time — 12-hour splits the hours at the meridian into a morning ring and an afternoon ring • Calendar rings for the month and year, or a Monday-first week ring whose weeks are spent, not kept • Run the midnight cascade demo any time from the settings

Quiet by design: • Completely free, no accounts, no ads, no tracking — it never connects to anything • Works fully offline • Keeps the screen awake on a desk or bedside table

If the instrument keeps good time for you, you can send a drop — a small tip — and the face answers with the benefactor tinctures: other colors of bioluminescence, and a single grain of sand set on the seabed of the dial.

Drops become months.