Duffing Basins:
The Duffing oscillator has two stable fixed points near x=±1. For each initial condition (x₀,ẋ₀), we integrate forward to determine which attractor the trajectory reaches. Blue = attractor at +1, red = attractor at −1. At the boundary, the fractal structure has the Wada property: every boundary point is on the boundary of all basins simultaneously. The fractal dimension of the boundary d_f > 1.