I think that instead of adding one marble at each step, it's better to add a fixed percentage of existing marbles, e.g,, 0.25%. This will better approximate the

I think that instead of adding one marble at each step, it's better to add a fixed percentage of existing marbles, e.g,, 0.25%. This will better approximate the processes that are being modeled. But then the effect shown in the article will disappear.