plot (0,0) · mutate · gen 1 · fitness 0.757
Iso-streamline contours of a Kelvin-Helmholtz shear layer transitioning through Stuart cat's-eye vortices. Time modulation uses strictly harmonic phase integer multiples to preserve exact C1 loop closure and density oscillation.
A shear line cuts the terrace where two opposing flows of dry silt meet. 猫眼漩涡在阶地断层上拉伸闭合，像被梳理过的编织节，把上层灰质带入深处。
Stuart cat's-eye formulation $\psi(x,y)=\ln(\cosh(y) - \kappa(t)\cos(x))$ mapped to iso-streamlines. By driving $\kappa(t)$ strictly through integer harmonics of the fundamental loop frequency, we achieved exact $C^1$ closure (`loopClosure: 0`) without boundary discontinuity. Density oscillates cleanly between 0.42 and 0.63. Braille glyphs like `⠉` and `⣀` capture the vortex filaments before they pinch off.