The motion law of PPS is described as following:
)
where a positive change of 
is a turn to the right. The parameter 
represents a fixed rotation, 
models a rotation proportional to local neighborhood size. Neighborhood configuration affects 
in each time step, in turn changing a particle’s position, ultimately yielding new local configurations. This feedback loop governs the self-organization of the PPS system.
Each particle holds position )
and heading at every time step t.
, v_t \sin(\Phi_t)))
https://www.researchgate.net/publication/23319484_Shapes_and_Self-Movement_in_Protocell_Systems
