A Gentle Device

Actually the more I look at it the more I like it. I kinda wanted to show what's going on in Gentle's brain. All of the unspeakable violence she's witnessed and perpetuated

One of the most interesting details about Rainbow Factory is that the production of rainbows serve no actual purpose. In Pegasus Device they explain that the pegasi of old were just killing disabled pegasi and experimenting on them to see if they could find a use for their corpses. That's when they discovered spectra. Some fanfics add that rainbows help distribute magic to pegasi so that they can fly and walk on clouds, but I think the idea that rainbows are basically just used as an excuse to create a pegasus ethnostate makes the story more realistic and layered.