“That’s the best way to experiment,” Forerunner said. “Change as little as possible in each occasion. It would work better if there weren’t so many variables on Earth. Equestrian society can change and adapt to what we do in ways that my program cannot anticipate. And the ring itself is built by powers that I cannot comprehend any better than you can. If this were an ordinary planet, or at least one without civilization, my ancient program would work better.”