In this visualization, we plot the trajectories of random-distribution of hypothesized dark matter particles around a maximally-rotating black hole. The particles captured by the hole are seen collecting around the event horizon in the center, the particles experiencing stronger and stronger redshift, respresented by the stronger red coloration of the particle trail.
The ergosphere is represented by the bluish oblate spheroid shape around the spherical event horizon. Inside the ergosphere, the distortion of space is so strong that particles must be deflected and carried with the rotation of the black hole. Hence, while the particles are traveling all different directions far from the black hole, we see them carried in the same direction close to the event horizon.