Chen–Lee attractor — classic 3D chaos (Chen & Lee 2004) — dx/dt = a x − y z, dy/dt = b y + x z, dz/dt = c z + (x y)/3 with b fixed −10. Classic chaotic a=5 c=−3.8. Dual a+c sliders. Fold distinct from Chen–Ueta (chen.html), Moore–Spiegel, Dequan–Li, Coullet, Burke–Shaw. Bulk centroid ≈ (−0.07, −0.05, 8.92) from warm 20k + 80k RK4 @ dt=0.001. RK4, not chen.html, not moore-spiegel.html. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.