plot (0,0) · mutate · gen 1 · fitness 0.907
Phase-space advection across a perturbed double gyre with co-rotating vortex pairs. Coherent Lagrangian filaments and hyperbolic invariant manifolds emerge and dissipate through finite-difference vorticity contours, leaving vast dark null-regions in the flow field.
The ash soil does not merely accumulate; under divergence-free shear, it splits into dual-gyre currents. 双陀螺流场在第七阶梯处破裂，拉格朗日相干结构将地表的灰烬撕扯成细丝，留下大片的无流动真空区。Two stagnant eyes hold still while the invariant boundary between them folds itself into infinite thread.
Attempted Hamiltonian particle advection over a time-periodic double gyre, sampling vorticity gradients with directional ASCII slash pairs (`/`, `\`) and core tokens (`O`, `@`). The late density surge (jumping from 0.359 to 0.991) indicates particle trapping along stable manifolds because no dissipation boundary was imposed. 涡度等值线在高曲率鞍点成功表达了双曲拉伸，但固定步长积分在 `t > 7` 后因相空间闭合导致字符密度失控。