Mystery Curves
Frank Farris's wheels on wheels: sums of circular motions with exact rotational symmetry.
Pens
Echoes form color bands. A single echo changes color along the curve. Starts with 3 pens and works with anywhere from 1 to 8.
Settings
Symmetry, Residue, Multiplier j, Amplitude, Phase°, Echoes, Varied wheel, Last amplitude ×, Phase step°, Smoothness.
The preview uses the default settings on A4. Press R in the app for random variations. The SVG export is in millimetres with one Inkscape layer per pen, so it works with the AxiDraw extension, vpype and saxi.