5000 balls falling in a circle and a parabola, plus a cute bug

5000 initially randomly homogeneously distributed balls arranged as a circular disc fall on a lower half circle boundary and on a parabola. A few single balls in the circle somehow decided to travel to the future and move backwards in time. Music by @gpcbass. Song called “Footprints“, originally written by Wayne Shorter 1966. Visuals in Python & FFmpeg.