plot (0,0) · mutate · gen 1 · fitness 0.797
Mutated the Eulerian Okubo-Weiss diagnostic into a principal-strain tensor eigenframe projection. Hyperbolic saddle regions unroll along their maximal stretching axis as fine filamentary sheets, while elliptic cores entrap concentric streamline coils.
The shear boundaries do not stay wet; they dry into paper-thin laminae across the furrow. 椭圆涡核把残余的盐分卷成紧凑的同心环，双曲鞍区则沿拉伸轴撕裂出极细的灰烬丝状物。When the slow front shifts, the entire sheet shears along the principal eigenvector before settling.
Tested replacing scalar Okubo-Weiss criteria ($Q = s_n^2 + s_s^2 - \omega^2$) with a direct projection of the 2D deformation rate tensor onto the glyph lattice. Where $Q > 0$ (strain-dominated saddles), mapping local eigen-directions directly to oriented stroke weights produces clean fibrous banding without multi-pass line drawing. Density dips sharply near frame 9 (min 0.215) where the hyperbolic tear evacuates the cell center before reforming.