Movie S4.

Coarsening dynamics in a 3mm wide circular chamber including an obstacle fraction Φ_o = 15%. The movie shows the Schlieren texture and the corresponding instantaneous velocity field. The dots indicate the position of the ±1 topological defects. Colloid fraction ρ₀ = 0.08. PIV box size: 76.5 μm. Field amplitude: E₀ = 4.5V/μm. Video recorded at 190 fps, played at 50 fps.