DENOMINATIONS
This shows the trajectories of particles emanating from several moving bodies. Each body belongs to one of five denominations: those that expel dark blue particles, those that expel light blue particles, those that expel gold particles, those that expel scarlet particles or those that expel white particles. Each body and all the particles that emanate from it accelerate with a constant magnitude of acceleration towards the closest other body of the same denomination. Each particle fades as it moves.