OOC
I seem to have taken on an organizer role, huh? It's a terrible habit. At least here it's effective; you should see the mess when @ylva tried this on Elliquiy! Anyway, what she told me about the philosophy that Made Anaya, when I asked for some detail, was that it focused on rest, meditation, trance, dreams, inner and outer peace, very calm and contemplative things like that. So that's what I've been rooting all my advice in.
Okay then. Rebellious art movements are pretty common during any time of high stress in a society—a war, a crisis of leadership, major corruption, a lengthy plague, you get the idea. Sometimes visual arts, sometimes musical, sometimes dance if that's important enough to a (sub)culture's expression. Honestly, if one didn't already exist, I'm sure the current events would start one up.
If they've been going for a while in opposition to the caste system, then there has likely been unrest among the lower castes for a long time, and it has spread among the educated castes who set formal culture in the past five years. Ten at the longest; something that survives longer than that and hasn't gotten any official changes made often moves to violent conflict.
Actually, I'd go for the 5-10yr range. Recruiting a theotech engineer sounds like a move toward more overt/organized resistance to the system. I can easily see Anaya falling apart as the catalyst that both emboldened them and gave them a perfect propaganda opportunity.
But La has no part in it. She had more access to the priest caste and their radius of luxuries than the large majority of other Servants. She was doing a pretty good job of inculcating herself with the orthodox theology (a rough merger of ideas from Hinduism, buddhism, and confucianism, for now).