Cardioid1 cusp

y = x · 2.00 (mod 200)

The envelope of these chords is a cardioid.

Nail & Thread

Times-table string art · brass on walnut

2.00multiplier

Turn the dial, or press ← → for 0.1 steps

Nails200

Thread opacity55%

Silk

Nail i is tied to nail i × m (mod N). Fractional m slides each thread’s far end smoothly between neighbouring nails.
Keys: Space play · E envelope · W wind