id: 1261375. Turns out it is not new
Adding BREL yeilds some interesting results.
orbital motion... And next?
The circular motion also resists destablisation by a 1s 6 pixel radii pulse of negative pressure but extremely sensitive to positive pressure
At 6 particles, the circular motion stablise and become a perpetual motion that neither consumes nor produce energy
It is observed that as the number of stoen particles < 6 the circle is unstable and slowly collapses (unless it is supported by another circular configuration outside of it) and when the stone particles are > 6, the circular motion became a perpetual motion generator as it slowly increase in radius for each revolution. The reason for this is not well understood.
(occassionally in the preparation process, a tower of material will form due to the stacking. The trick is to delete the stack when the particles get splashed from the tower as it falls and get a curved trajectory, such that when they fell again, they will not bump into anything. Cushioned by the air pressure produced by the CO2, the trajectory became more curved and eventually stablise into the circular motion)
The phenomenon is now reproduced by SecretLabs by first putting some CO2 at the centre, drop stone or concrete or sand from a far away location. As the stone accelerates, the CO2 divert the motion and result in them moving in circular trajectories. When each particle moves, it produces a small air pressure which drag the particle behind it towards it and so on. When the motion is finally stablised, the CO2 is deleted, the save is then saved to give what is observed here.