Suzu lab / Duffing and the kicked rotor

A spring that stiffens as it swings — struck hard it clangs sharp and settles — and the standard map played as an oscillator, its momentum the pitch: order, then chaos, by one knob.

The section

The orbit

the cell's (x, y), from the engine's ring

Spectrum

the note's harmonics

What it sounds

Note
—
Sounding
—
Off the note
—
K
—
The momentum's spread
—

— the pitch, cents from the note

Play

the engine loads with the sound

Click a key to hold the note. Keys also on the keyboard: A W S E D F T G Y H U J K. The canvas's Chirikov operator stirs the water with this same map — one theorem, two senses.