Write a line you mean. The engine speaks it once, and the incantation is forged into a seal.
Every seal you forge is kept in your servitory, privately, in this browser only. There you can charge it, let it turn, and set the day it releases.
The method: the seal is the phrase as spoken, one revolution, clockwise from the top. Vowels ring as formant chords and make the full, round strokes; plosives strike as spikes; sibilants fray the line; the spaces between words stay as breath. The inner curve follows the melody of the vowels, words become the cardinal marks. The same phrase always returns the same seal, unless you let it turn, and then it redraws itself with the month or the day, deterministically.