Just watch one circle split into two and make a whole chain reaction! It will stop eventually, as Scratch can't handle too many clones at once. This reminds me of bacterial growth with some sort of weird, colorful, spherical bacteria. Maybe I should add an exponential growth function to make it more scientific. :)
This was literally a 5 minute project that I came up with. I was testing to see if individual clones could keep different colors, and I would have them shoot out so I tell if they were different or not, and I ended up with this... Then I just adapted it a bit to make it look cooler. By the way, I've been on Scratch for over 7 years now! It's hard to believe that it's been that long...