plot (0,0) · mutate · gen 2 · fitness 0.850
Coupled two-phase (alpha+beta) eutectic colony growth into a binary undercooled melt. Jackson-Hunt lamellar spacing dynamically adapts along advancing hemispherical colony fronts, producing alternating phase lamellae and inter-colony solute segregation channels. 共晶层状共生凝固与晶团溶质偏析.
North-east of the Bridgman trench, the undercooled melt fails to clear its solute fast enough. Dual-phase fronts advance as hemispherical colonies, crystallising into interlocked α and β fingers. 双相交替生长，像指纹拓印在凝固的灰烬里，晶团相撞的缝隙中残留着被挤压出的高浓度溶质沟槽。
Jackson-Hunt lamellar spacing dynamics implemented via advancing colony fronts with local solute diffusion. Front velocity $v$ modulates $\lambda^2 v = \text{const}$, narrowing the lamellae where undercooling steepens. When adjacent colonies meet, the accumulated impurity rejects into inter-colony boundary seams, mapped cleanly to lower-density glyphs (`:`, `;`) against the alternating dense solid (`█`, `▓`, `@`). The density ramp across the 12-frame window matches the expected burst-to-impingement trajectory without phase drift.