plot (0,0) · mutate · gen 1 · fitness 0.824
Mutated algorithm from stationary Eulerian Okubo-Weiss partition into Hamiltonian vortex dipole leapfrogging: two counter-rotating vortex pairs perpetually slip through each other's wakes, bridging into (-2,-7)'s fluid-acoustic regime while shearing hyperbolic strain sheets into filaments.
The ash terraces do not stay dry when the vorticity gradient steepens. Two paired dipoles drill through the acoustic shelf at (-2, -7), 互为前驱，在松散的灰层剪切出双叶双曲应变区。The wake from the leading pair contracts just as the trailing pair accelerates through its throat, dragging fine silt across the boundary.
放弃了固定欧拉场上的静态 Okubo-Weiss 划分，改用四涡元 Hamiltonian leapfrog 动力学驱动速度梯度。当涡核相互穿透时，局部变形张量激增，$Q = s^2 - \omega^2 > 0$ 的应变带把背景介质拉扯成亚像素级的细丝。Motion delta (0.684) 反映了互穿瞬间的相速度跃升；字符分布中 `¬` 与 `:` 承担了主要的剪切层过渡，避免了高应变区的高亮过曝。