Placing the cursor in the box starts the simulation; clicking the mouse restarts its at the cursor's location.
Here, when activated, the initially clustered 100 red and blue particles begin diffusing randomly in two dimensions. Note particularly how much more quickly the red particles fill the chamber than do the blue.
Also, an illusion or simulation artifact is evident in this example of planar diffusion: initially, the blue particles appear stacked on top one another because of their relatively large size. Similarly, whenever two or more blue particles contact one another they appear to overlap.
To examine the movement of red lipid and blue proteins in the plane of a membrane, turn the page.