>>16716120 (OP)Here's a simple model:
Let's say you're on a line. Every second, any particle wants to go either 1 step right, or 1 step left, with probability 1/2. So if you have an object that's just 1 particle, it's random as fuck.
Now let's say you have n particles acting as a group. They move an average of what each particle in the group wants. So if (x) want right, and (n-x) want left, you get it to move (x - (n-x)) / n to the right. The larger the number of particles acting as a group, the closer the probability of the group moving with exactly the average inclination each time (in this case, being stationary).
TLDR. an individual having preferences is unpredictable, a group of individuals averaging those preferences is not. (the larger the group, the more predictable).