Engrave your own rosette

A guilloche is the engraved lattice on a banknote or a stock certificate: rings of waves, each copied ten times a little out of phase, so their interference looks cut into the paper. Truenote's has four rings.

Your figures set how deep each ring's waves run. The month-to-month moves set the lobes (a steady year draws shallow ones, a year with big swings deep ones); where each month stood between your lowest and highest sets the slow swell. No two histories draw the same rosette, and the same figures always draw the same one.

The figures stay in the link (?f=) and nowhere else: nothing is sent or kept. The sample household is the seeded one the home page prints its note from, no one's real money.